Regression Analysis - 19751 Words

Confidence intervals and prediction intervals from simple linear regression The managers of an outdoor coffee stand in Coast City are examining the relationship between coffee sales and daily temperature. They have bivariate data detailing the stand s coffee sales (denoted by [pic], in dollars) and the maximum temperature (denoted by [pic], in degrees Fahrenheit) for each of [pic] randomly selected days during the past year. The least-squares regression equation computed from their data is [pic]. Tommorrow s forecast high is [pic] degrees Fahrenheit. The managers have used the regression equation to predict the stand s coffee sales for tomorrow. They now are interested in both a prediction interval for tomorrow s†¦show more content†¦The next term in the prediction interval formula is the standard error of the estimate, [pic]. It can be computed from the mean square error (MSE), which is given to be [pic]: [pic]. The last part of the prediction interval formula consists of the square root of the sum of [pic] and a fairly long expression. We do not need to compute the long expression, though, because we were given its value: [pic]. We have With this information, we can compute the [pic] prediction interval for the coffee sales given a maximum temperature of [pic] degrees Fahrenheit: [pic]. Upon simplification, this is the interval whose lower limit is approximately [pic] and whose upper limit is approximately [pic] 2. Because there s more precision involved in estimating the mean of a distribution than in predicting a particular observation from that distribution, we would expect the confidence interval to be narrower than the prediction interval. We can verify this by comparing the formulas for computing the intervals (shown near the top). As noted previously, the only difference between the prediction interval formula and the confidence interval formula is that the prediction interval formula has a [pic] in the sum underneath the square root, while the confidence interval formula does not. This makes the margin of error (the term following the [pic]) greater in the prediction interval formula than in the confidence interval formula, which means that theShow MoreRelatedApplication Of A Regression Analysis1241 Words   |  5 Pagesthe same explanatory variables appear in the log-log equations, which is in fact OLS is equivalent to seemingly unrelated regression, it is not possible to improv e the separate least-square estimation using a seemingly unrelated regression technique. Table 1 gives some details on the variables employed in the analysis. 4.1 Multicollinearity The purpose of regression analysis, we define first: N: Number of observation n: Number of independent variable y: Sample of ‘N’ observations on one dependentRead MoreRegression Analysis For A Dependence Method753 Words   |  4 PagesRegarding the testing of the hypotheses of this research, regression analysis or structural equation modelling techniques is best suited for a dependence method (Hair et al., 2014). We employed regression analysis to specify the extent to which the independent variables predicted the dependent variable. The analysis conducted in this study was therefore intended to test the hypotheses of the study. The regression output provided some measures which allow assessment of the hypotheses. Following fromRead MoreRegression Analysis1445 Words   |  6 Pages | LETTER OF TRANSMITTAL April 12, 2012 Dr. Abul Kalam Azad Associate Professor Department of Marketing University Of Dhaka Subject: Submission of a Report on regression analysis Dear Sir, Here is our term paper on regression analysis that you have assigned us to submit as a partial requirement for the course –â€Å"Business Statistics 1† Code no-212.While preparing this term paper; we have taken help from internet, books, class lectures and relevantRead MoreRegression Analysis for Demand Estimation1065 Words   |  5 PagesDemand Estimation by Regression Method – Some Statistical Concepts for application ( All the formulae marked in red for remembering. The rest is for your concept) In case of demand estimation working with data on sales and prices for a period of say 10 years may lead to the problem of identification. In such a case the different variables that may have changed over time other than price, may have an impact on demand more rather than price. In order to void this problem of identification whatRead MoreMlb Regression Analysis Data1212 Words   |  5 Pageseach of the variables specified in the model from the years 2003 to 2005. The question that I will be answering in my regression analysis is whether or not wins have an affect on attendance in Major League Baseball (MLB). I want to know whether or not wins and other variables associated with attendance have a positive impact on a team s record. The y variable in my analysis is going to be attendance for each baseball team. I collected the data for each team s average attendance for 2003-2005Read MoreRegression Analysis1447 Words   |  6 PagesREGRESSION ANALYSIS Correlation only indicates the degree and direction of relationship between two variables. It does not, necessarily connote a cause-effect relationship. Even when there are grounds to believe the causal relationship exits, correlation does not tell us which variable is the cause and which, the effect. For example, the demand for a commodity and its price will generally be found to be correlated, but the question whether demand depends on price or vice-versa; will not be answeredRead MoreRegression And Correlation Analysis Paper Essay1128 Words   |  5 PagesStatistics Project PART C: Regression and Correlation Analysis A. Introduction and Summary Report: ALLSEASONS is a Chicago company that specializes in residential heating and cooling systems. Their call center has 100 employees who handle both inbound and outbound calls to schedule appointments for service technicians. Call center employees can schedule any type of appointment but they are assigned to one of three specialized teams, as noted below. During the first week of September the callRead MoreRegression Analysis1134 Words   |  5 Pagesflown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weeks: |Week |1 |2 |3 |4 |5 |6 | |Demand |17 |19 |15 |21 |20 |23 | Problem 7 [6] A careful analysis of the cost of operating an automobile was conducted by a firm. The following model was developed: Y = 4,000 + 0.20X where Y is the annual cost and X is the miles driven. a) If the car is driven 15,000 milesRead MoreRegression Analysis1301 Words   |  6 PagesIntroduction This presentation on Regression Analysis will relate to a simple regression model. Initially, the regression model and the regression equation will be explored. As well, there will be a brief look into estimated regression equation. This case study that will be used involves a large Chinese Food restaurant chain. Business Case In this instance, the restaurant chain s management wants to determine the best locations in which to expand their restaurant business. So far the mostRead MoreRegression analysis of oil price return3199 Words   |  13 Pagesï » ¿ Contents 1.0 Introduction and Motivation 2 2.0 Methodology 5 2.1. Descriptive Statistics 5 2.2 Matrix of pairwise correlation. 6 3.0 Model Specification 6 3.1 Linear Regression Model. 6 3.2 The Regression Specification Error Test 8 3.3 Non-linear models 9 3.4 Autocorrelation. 10 3.5 Heteroskedasticity Test 10 4.0 Hypothesis Testing 11 5.0 Binary (Dummy) Variables 11 6.0 Conclusion 13 Reference List 13 1.0 Introduction and Motivation Crude oil is one of the world’s most important natural

The Impact Of Communication Technology - 955 Words

â€Å"Thanks to the advancement in communication and computer science, nearly anything you can imagine is just a click away.† (Ertem, 2015) Technology has revolutionized the way we conduct business worldwide. You can now video chat with customers who are across the world, in just a few seconds. Communication technology is essential in growing your business and improving efficiency. Since the 1980’s technological advancements have certainly grown substantially, which help with productivity and efficiency in the workplace. When cellular phones were first put on the market they were only able to make and take calls. Now cell phones can check emails, make video calls, purchase items, sell items and storage vast amounts of information. Tablets and†¦show more content†¦Through software programs like QuickBooks, you can keep track of how your company is doing with inventory and the financials. QuickBooks can run detailed reports and charts of the sales and expenses. B eing able to track the overhead expenses, revenue and output within your company helps track productivity. Through software programs and access to a vast range of information on the Internet, employees have become very efficient. The last advantage of communication technology is being able to work from home. Working from home gives the employee freedom that creates a good work-home life balance. â€Å"It s also good for employers when employees have happy, balanced lives† (Burg, 2013). Many companies view working from home as cost-saving, and a flexible alternative to the traditional office. With advantages, there is always disadvantages. Some disadvantages with growing technology in the workplace is distractions from work, lack of the face-to-face interpersonal relationships, power failure and the high cost of equipment. Social media and surfing the Internet are big distractions for people in the workplace. â€Å"Wasting time through internet activities is simple and it is a huge hidden cost to business† (Collo, 2013). Setting limitation, rules and boundaries from the beginning can help reduce the wasting of time and money for the company. Emails have changed the workplace drastically. Instead of calling, many workers today sendShow MoreRelatedThe Impact Of Technology On Nonverbal Communication1432 Words   |  6 Pagessocial media and technology can sometimes be challenging, what are these challenges and how does this affect the nonverbal communication; and do you think this form of communication causes inabilities to interact positively and work effectively with others. While communicating through new technologies and social media can be challenging at times for some, one must also remember that â€Å"nonverbal behaviors can be important in establishing trust in working relationships, but modern technologies may challengeRead MoreImpact of Technology on Personal Communications888 Words   |  4 PagesThe Impact of Technology on Personal Co mmunications Introduction Innovations in technology are making communication easier in todays world, but some observers suggest that these advances have been at the expense of personal contact as many people choose to interact from home in front of a computer screen. Nevertheless, the trend is clear and more and more people are using digital platforms to interact rather than traditional face-to-face interactions. Indeed, Match.com even proclaims in itsRead MoreImpact Of Information And Communication Technologies2569 Words   |  11 Pages INTRODUCTION I. Impacts of information and communication technologies (ict) and e-commerce development a. The role of the ICT and the Globalization in the Rise of the e-Commerce Industry. Nowadays, from Americas to Europe, and from Asia to Africa, people are wearing blue jeans, watching MTV, using Apple products, eating burger and sushi. This is a picture of the globalization bringing the world closer through the exchange of goods and services, information, knowledge and cultures. Over the lastRead MoreTechnology And Its Impact On The Advancement Of Communication862 Words   |  4 Pagescommunicating through the network. Back in the day, communication is vastly different than today. Throughout history, it started off orally; just by speaking and hand gestures. It slowly advanced to postal services, and first manuscripts. Eventually new inventions were made, such as the typewriter, telephone, and radio. Technology today allows us to communicate through electronics such as cell phones, social networking websites, and email. Communication has changed a lot throughout the years and is stillRead MoreThe Impact of Technology in Organizational Communication Essay1403 Words   |  6 PagesThe Impact of Technology in Organizational Communication The relationship between technology and communication in todays organizations is significant. Technology can even change the way organizations are structured when a new system is introduced. Moreover, in many organizations, new IT systems have complicated the way people communicate by adding complexity to the organization structure. This could be the case for financial systems such as SAP, which are designed to meet requirements of oneRead MoreCommunication Technology: The Impact of the Telegraph on Society 1260 Words   |  6 PagesOver the course of the next two essays, we will address the factors which made the advent of the telegraph in 1876 such a deciding influence on the future prospects of the technology industry as well as the growth of communication itself. We will also observe examples of just a few of the logistical, financial and distributional processes that go into the publication of a magazine designed for controlled circulation. Essay #1 Read MoreImpact of Information Technology in Business Communication1181 Words   |  5 Pages*IMPACT OF INFORMATION TECHNOLOGY IN BUSINESS COMMUNI*CATION We are in the midst of a third major revolution in human civilization. First there was the Agricultural Revolution, then the Industrial Revolution, and now we are in the Information Revolution. Information and communication technology and a world wide system of information exchange has been building growth for over a hundred years and physical technology and industry is not slowing down in growth - rather it is accelerating. InformationRead MoreImpact of the Information Communication Technology on Education1239 Words   |  5 PagesIntroduction Not even a single aspect of life has remained untouched or unaffected by the advent of information communication technology. But one aspect of life that is most affected by ICT is education. ICT has brought about various changes in the style of teaching, in working conditions, and in the ways which are used in handling information. Teaching approaches are being highly modified by the presence of ICT (Mikre, 2011). We reside in a technological society under which the educationalRead MoreNew Communications Technology And Its Impact On The World760 Words   |  4 PagesWith the advent of new communications technology and more cost effective travel; the markets of the world have become more aware of different products and processes. As a result of this awareness, there are segments in each market that have had similar experiences and thus have common needs(Cateora, P., Gilly, M., Graham, J.). These common needs are often described as a demand for high quality, reasonably priced, standardized products. There is a strong feeling that within each country’s marketRead MoreEthics And Ethical Impacts Of Information And Communication Technology702 Words   |  3 Pagestransportation, entertainment, and on and on. Consequently, information and communication technology (ICT) has affected – in both good ways and bad ways – community life, family life, human relationships, education, careers, freedom, and democracy (to name just a few examples). â€Å"Computer and information ethics†, in the present essay, is understood as that branch of applied ethics which studies and analyzes such social and ethical impacts of ICT.† (Stanford Encyclopedia of Philosophy) However, ethics and laws

A peaceful woman explains why she carries a gun free essay sample

Now days world is not safe. According to the CDC, â€Å"non-contact unwanted sexual experiences† are the most prevalent form of sexual violence in the Unites States. Every 2 minutes, someone in the U. S. is sexually assaulted. According to the online studies by Stop Street Harassment, 99% of respondents said that they had been harassed at least a few times. â€Å"A Peaceful Woman Explains Why She Carries a Gun† by Linda Hasselstrom exemplifies a use of having a gun for protection as a last resort. Hasselstrom was justified for her need to own a gun as she wanted to be protected, safe and have a peace of mind. Desire to be protected justified Hasselstrom to get a gun; however, she considered other means of protection first. To begin with, Hasselstrom used improvised means for protection. For example, she had her own â€Å"gun† (spray cans of deodorant) which did not have to be registered. We will write a custom essay sample on A peaceful woman explains why she carries a gun or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page However, one night while camping, the author and her friend, harassed by two young men, decided not to tempt fate and use their â€Å"improvised mace†, but simply leave the camping area. When improvised means of protection did not work, Hasselstrom considered another option- a citizens band radio, a system of short-distance radio communications between individuals which does not require a license. However, she rejected this method of protection providing an example of a woman who got beaten and raped using a CB radio to get help with a flat tire. The last method Hasselstrom considered as a mean of protection was self-defense. For her, kung fu class was a smart decision because on the top of her self-preservation, her height and weight did not give her any benefit. Therefore, looking for protection, Hasselstrom provided the readers with justified steps she took prior to the extreme measure of protection- a gun. Also, the author was well-grounded for her need of a gun because she wanted safety. Firstly, she did not feel safe on her land. While Hasselstrom lived on a ranch in secluded area 25 miles from the nearest town, she, somehow, managed to have uninvited guests on her property. For example, one day she noticed an armed man on her land who wanted to shoot ducks. As a result, she could not feel safe even on her territory. Secondly, as the author was vulnerable even while driving her car, her possession of a gun was reasonable. Hasselstrom provides the readers with examples to prove her right. In one of the examples, an unknown car was following her on her way home, and made her stop by flashing a blinding spotlight in her face. Another example depicts a man who was playing cat-and-mouse with Hasselstrom within 30 miles when she was driving in a desolate part of Wyoming. Thirdly, the fact that Hasselstrom did not feel safe even in public places justified her to own a gun. She provided an example of her and her friend being harassed and scared by men while camping in the West. Moreover, looking for some help from the local rangers, she had to face with their carelessness and unwillingness to protect and help. In addition to Hasselstrom’s desire of protection and safety, there is a desire of peace she was looking for which justified her to possess a weapon. First of all, she could not get a peace of mind being harassed on a daily basis. Whether she was among people or on her property, she faced acts of harassment or danger which took her further away from a peace she was searching for. Then, she could not find a peace of mind if she was constantly stressed out, suspicious and scared about everything. One day the author found deep tire ruts in her yard and garbage in her driveway. More likely, that fact would lead a person like her to suspect that someone unfriendly had an intention to hurt or do her harm. Third of all, Hasselstrom lived in the environment where women did not stand much for a chance of not being harassed. Men in her area worried her, and their harassment would not stop until stronger measures were taken. However, Hasselstrom did not want to be either daily harassed, be another victim of rape or permanently stressed out and scared. Threfore, she believed that having a gun handy would lead her to a peace of mind she was looking for. In conclusion, relying on Hasselstrom’s examples provided in the article, she was justified for her need to own a gun. She had no choice but to use it in dangerous situations to protect herself. When used responsibly, women in the same situation as the author would live protected, safe and with peace of mind they desire. What Hasselstrom’s message was in this article is that no one, man or woman, should live in fear. And in her situation, owning a gun gave her that security.

Influence of Class Size free essay sample

Education has a significant role in part of development of a country. If a country is developed from military, cultural, political and other parts, so it is because of high level of education on that country. Countries that have low and weak level of education they still live in traditional societies. For instance, Afghanistan currently doesn’t have a good education. In every country there are different education systems and every country work with a given educational policy to develop its education system in the world, though every system doesn’t work in all countries. There are many policies for academic achievement. Some analysts believe that class size can also be considered as an effective element in academic achievement. Some analyst has the idea of small classes that can be more effective for academic achievement. In addition, to the idea of class size influence on academic achievement there can some other elements that could have influence on academic achievement. We will write a custom essay sample on Influence of Class Size or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page For example, people live in different cultures and obviously all people are not same they have different talents. In some countries smaller classes can bring good results and could be counted an effective factor on academic achievement. In a small class most students can have participation and feel free to express their ideas and share their questions without any hesitancy to teacher. In addition, in small classes teachers also can give participation to all students. Also in small class teacher can have better control than a large class having many students. Not many students in a classroom avoid clamor and disturbances, that the teacher can make good use of the time and make student to have active participation in the class, for example making some group studies on a specified topic or project. Moreover, smaller classes pave the way for teacher to have attention on all students in the class and have some discussion or arguments inside the class (Ehrenberg. et. al, 158). Giving presentations and speech for few minutes in a class can be effective and beneficial for a student that this can be more likely possible in small classes for students to work individually on a small project and present it in the class. Also studying in a small class makes it possible to divide students into small groups to have some group discussions and debates inside class that give more courage to a student to express their ideas inside the class and also outside class. There are different cultures, customs, talents and life styles that people have in the world. Difference in culture, custom, talent, way of living, family and many other things can be counted as an effective factor on a student’s academic achievement than effect of class size on academic achievement. In many countries of the world there are large classes with many students. These students in large classes may have good academic achievement than the students in other countries that study in small classes and the reason cannot be the class size it can be other reasons, for example the difference between the length of academic years in the countries. â€Å"Japanese teachers and students also spend much more time together—the usual year is 40 days longer than in the United States—and more time bonding with one another at school festivals and on field trips and hikes† (Lewis, 161). Or also it can have some other reasons, like family help to a student it may have impact on a student’s academic achievement and help the student to do a good job and have good results. â€Å"Asian parents are far less likely than Americans to be divorced and are more likely to be involved in their children’s education† (Zorpette, 161). There are many factors on academic achievement and all the countries in the world do not use the same policy or system for having better education system. Europe has its own policy to have the best education system and Asia has different policy and system to have high education level. With many factors that have influence on academic achievement, one of them that can have effect on academic achievement can be effect of class size. Some analysts believe that small classes can have better influence on academic achievement. But, some other analysts believe that large classes can be more effective on academic achievement. Both, ideas are respected, because one policy or analyze can work for a country, but not for another country because the conditions differ. In every country there are different people, different ideas, different talents, and many other situations that differ from each other. So, class size can be counted as a factor of influence on academic achievement.