SHOW YOUR WORK IN THE SPACES PROVIDED BELOW FOR FULL CREDIT. a. Based on a sample of 1535 Internet users, a University of Southern California sponsored study reported Internet users followed an average of 9.9 companies on social network sites such as LinkedIn. State the population for this survey, the statistics, and some likely values from the population distribution.
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SHOW YOUR WORK IN THE SPACES PROVIDED BELOW FOR FULL CREDIT.
a. Based on a sample of 1535 Internet users, a University of Southern California sponsored study reported Internet users followed an average of 9.9 companies on social network sites such as LinkedIn. State the population for this survey, the statistics, and some likely values from the population distribution.
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- Consider again the example introduced in Section 7.5 of a credit card company that has a database of information provided by its customers when they apply for credit cards. An analyst has created a multiple regression model for which the dependent variable in the model is credit card charges accrued by a customer in the data set over the past year (y), and the independent variables are the customers annual household income (x1), number of members of the household (x2), and number of years of post-high school education (x3). Figure 7.23 provides Excel output for a multiple regression model estimated using a data set the company created. a. Estimate the corresponding simple linear regression with the customers annual household income as the independent variable and credit card charges accrued by a customer over the past year as the dependent variable. Interpret the estimated relationship between the customers annual household income and credit card charges accrued over the past year. How much variation in credit card charges accrued by a customer over the past year is explained by this simple linear regression model? b. Estimate the corresponding simple linear regression with the number of members in the customers household as the independent variable and credit card charges accrued by a customer over the past year as the dependent variable. Interpret the estimated relationship between the number of members in the customers household and credit card charges accrued over the past year. How much variation in credit card charges accrued by a customer over the past year is explained by this simple linear regression model? c. Estimate the corresponding simple linear regression with the customers number of years of posthigh school education as the independent variable and credit card charges accrued by a customer over the past year as the dependent variable. Interpret the estimated relationship between the customers number of years of posthigh school education and credit card charges accrued over the past year. How much variation in credit card charges accrued by a customer over the past year is explained by this simple linear regression model? d. Recall the multiple regression in Figure 7.23 with credit card charges accrued by a customer over the past year as the dependent variable and customers annual household income (x1), number of members of the household (x2), and number of years of post-high school education (x3) as the independent variables. Do the estimated slopes differ substantially from the corresponding slopes that were estimated using simple linear regression in parts (a), (b), and (c)? What does this tell you about multicollinearity in the multiple regression model in Figure 7.23? e. Add the coefficients of determination for the simple linear regression in parts (a), (b), and (c), and compare the result to the coefficient of determination for the multiple regression model in Figure 7.23. What does this tell you about multicollinearity in the multiple regression model in Figure 7.23? f. Add age, a dummy variable for sex, and a dummy variable for whether a customer has exceeded his or her credit limit in the past 12 months as independent variables to the multiple regression model in Figure 7.23. Code the dummy variable for sex as 1 if the customer is female and 0 if male, and code the dummy variable for whether a customer has exceeded his or her credit limit in the past 12 months as 1 if the customer has exceeded his or her credit limit in the past 12 months and 0 otherwise. Do these variables substantially improve the fit of your model?The Pew Research Center Internet Project conducted a survey of 857 Internet users. This survey provided a variety of statistics on them. The sample survey showed that 90% of respondents said the Internet has been a good thing for them personally. Develop a 95% confidence interval for the proportion of respondents who say the Internet has been a good thing for them personally. The sample survey showed that 67% of Internet users said the Internet has generally strengthened their relationship with family and friends. Develop a 95% confidence interval for the proportion of respondents who say the Internet has strengthened their relationship with family and friends. Fifty-six percent of Internet users have seen an online group come together to help a person or community solve a problem, whereas only 25% have left an online group because of unpleasant interaction. Develop a 95% confidence interval for the proportion of Internet users who say online groups have helped solve a problem. Compare the margin of error for the interval estimates in parts (a), (b), and (c). How is the margin of error related to the sample proportion?A marketing professor at Givens College is interested in the relationship between hours spent studying and total points earned in a course. Data collected on 156 students who took the course last semester are provided in the tile MktHrsPts. Develop a scatter chart for these data. What does the scatter chart indicate about the relationship between total points earned and hours spent studying? Develop an estimated regression equation showing how total points earned is related to hours spent studying. What is the estimated regression model? Test whether each of the regression parameters β0 and β1 is equal to zero at a 0.01 level of significance. What are the correct interpretations of the estimated regression parameters? Are these interpretations reasonable? How much of the variation in the sample values of total point earned does the model you estimated in part (b) explain? Mark Sweeney spent 95 hours studying. Use the regression model you estimated in part (b) to predict the total points Mark earned.
- The Human Resources Manager for Optilytics LLC is evaluating applications for the position of Senior Data Scientist. The file OptilyticsLLC presents summary data of the applicants for the position. a. Use a PivotTable in Excel to create a joint probability table showing the probabilities associated with a randomly selected applicants sex and highest degree achieved. Use this joint probability table to answer the questions below. b. What are the marginal probabilities? What do they tell you about the probabilities associated with the sex of applicants and highest degree completed by applicants? c. If the applicant is female, what is the probability that the highest degree completed by the applicant is a PhD? d. If the highest degree completed by the applicant is a bachelors degree, what is the probability that the applicant is male? e. What is the probability that a randomly selected applicant will be a male whose highest completed degree is a PhD?In a recent report, the top five most-visited English-language web sites were google.com (GOOG), facebook.com (FB), youtube.com (YT), yahoo.com (YAH), and wikipedia.com (WIKI). The most-visited web sites for a sample of 50 Internet users are shown in the following table: a. Are these data categorical or quantitative? b. Provide frequency and percent frequency distributions. c. On the basis of the sample, which web site is most frequently the most-often-visited web site for Internet users? Which is second?Select one topic from the list below related to money and banking for the course. Once you have selected your research topic, review the materials in the text that can help you get started, and then begin conducting outside research using the online library, the internet, the Wall Street Journal websites, the Economist, and so forth. Your mini research paper should have the following. It should be approximately four to five pages (excluding reference and title pages). It should be written in APA format to include a title page, citations as appropriate, and a reference page at the end. APA format is double-spaced, indented paragraph format. These short papers do not require an abstract or running head. Topics (select one) What are the effects of electronic transactions and banking on the industry or monetary policy? Have innovations created greater or less efficiency? What has been the role of the Federal Reserve?
- Select one topic from the list below related to money and banking for the course. Once you have selected your research topic, review the materials in the text that can help you get started, and then begin conducting outside research using the online library, the internet, the Wall Street Journal websites, the Economist, and so forth. Your mini research paper should have the following. It should be approximately four to five pages (excluding reference and title pages). It should be written in APA format to include a title page, citations as appropriate, and a reference page at the end. APA format is double-spaced, indented paragraph format. These short papers do not require an abstract or running head. Topics (select one) What are the effects of electronic transactions and banking on the industry or monetary policy? Have innovations created greater or less efficiency? What has been the role of the Federal Reserve? 800 Words RequirementIn 2018, the Pew Internet & American Life Project asked 743 teens aged 13 to 17 several questions about their attitudes toward social media. The results showed that 602 say social media makes them feel more connected to what is going on in their friends’ lives; 513 say social media helps them interact with a more diverse group of people; and 275 feel pressure to post content that will get a lot of likes and comments. a. Develop a point estimate (p¯) of the population proportion of teens aged 13 to 17 who say social media makes them feel more connected to what is going on in their friends’ lives. b. Develop a point estimate (p¯) of the population proportion of teens aged 13 to 17 who say social media helps them interact with a more diverse group of people. c. Develop a point estimate ( p¯) of the population proportion of teens aged 13 to 17 who feel pressure to post content that will get a lot of likes and comments . for all (SHOW HOW YOU CALCULATE THE POINT ESTIMATE. (4 DECIMALS)assume that you are planning to purchase a new laptop for school, work, and home use. go to the website of two computer manufacturers and make a selection. complete the following items and questions. compare the following items for your selections in their financial statements. revenues for products, revenues for services, cost of goods sold, accounts receivable, inventories, accounts payable, and research ad development. what are some factors that can impact the gross profit of a merchandise company? one item that can help investors understand the relationship between net sales and net profits is the gross profit rates. find the financial information needed to calculate the gross profit rate for your two selected companies.
- Consider the following survey results regarding smartphone ownership by age: a. Construct a stacked-column chart to display the survey data on type of cell-phone ownership. Use Age Category as the variable on the horizontal axis. b. Construct a clustered column chart to display the survey data. Use Age Category as the variable on the horizontal axis. c. What can you infer about the relationship between age and smartphone ownership from the column charts in parts a and b? Which column chart (stacked or clustered) is best for interpreting this relationship? Why?Please help meThe company you are working for has decided to put on a banquet to raise money for a charity and must decide between two catering services to supply the food and servers. You have been assigned to the Banquet Planning Committee. You will submit your work, neatly hand-written or typed and clearly labelled. You will submit graphs separately via the Desmos share tool. You must use algebra to solve the problems and describe how to use Desmos or a graphing calculator to check you work. To best maintain accuracy, round only your final answers. Simplify completely.Research Provided:The Company’s research department has provided the following estimates: A demand of 330 banquet attendees can be expected at a dinner plate price of $70.00 each. A demand of 470 banquet attendees can be expected at a dinner plate price of $40.00 each. Catering Service A has a fixed cost of $1,800 and a marginal cost of $30 for each plate. Catering Service B has a fixed cost of $2,500 and a marginal cost of $22 for…
