Reference no: EM131009103
1. Shopping. A survey of 430 randomly chosen adults finds that 47 of 222 men and 37 of 208 women had pur- chased books online.
a) Is there evidence that the sex of the person and whether they buy books online are associated?
b) If your conclusion in fact proves to be wrong, did you make a Type I or Type II error?
c) Give a 95% confidence interval for the difference in proportions of buying online for men and women.
2. Information technology. A recent report suggests that Chief Information Officers (CIO's) who report directly to Chief Financial Officers (CFO's) rather than Chief Executive Officers (CEO's) are more likely to have IT agendas that deal with cost cutting and compliance (SearchCIO.com, March 14, 2006). In a random sample of 535 companies, it was found that CIO's reported directly to CFO's in 173 out of 335 service firms and in 95 out of 200 manufacturing companies.
a) Is there evidence that type of business (service versus manufacturing) and whether or not the CIO reports di- rectly to the CFO are associated?
b) If your conclusion proves to be wrong, did you make a Type I or Type II error?
c) Give a 95% confidence interval for the difference in proportions of companies in which the CIO reports di- rectly to the CFO between service and manufacturing firms.
|
Confidence interval for the difference in proportions
: Is there evidence that the percentage of boys who play these types of games is different in the two age groups? Give a 90% confidence interval for the difference in proportions.
|
|
Find the taylor series of the given function
: Find the Taylor series of the following at x = 0. (To be graded as correct, give your answer up to and including the x8 term. Answers with more or less terms will be graded as incorrect.)
|
|
Information on consumer preferences
: Fast food. GfK Roper Consulting gathers information on consumer preferences around the world to help compa- nies monitor attitudes about health, food, and health care products. They asked people in many different cultures how they felt about the f..
|
|
Establishment of a completely integrated treatment
: Advanced knowledge of the most complex and non-standard treatment and examination procedures and techniques. Ability to plan and assist in the establishment of a completely integrated treatment and examination program
|
|
Difference in proportions of companies
: Give a 95% confidence interval for the difference in proportions of companies in which the CIO reports di- rectly to the CFO between service and manufacturing firms.
|
|
Problem regarding the employment discrimination
: Employment discrimination? Census data for New York City indicate that 29.2% of the under-18 population is white, 28.2% black, 31.5% Latino, 9.1% Asian, and 2% are of other ethnicities.
|
|
Investigate the randomness
: To investigate the randomness, we'll look at data collected over a recent 32-week period.
|
|
Describe how you have represented weak entities
: Convert this data model to a database design. Specify tables, primary keys, and foreign keys. Using Figure as a guide, specify column properties. Describe how you have represented weak entities, if any exist
|
|
Problem regarding the sales rep travel
: A sales representative who is on the road visiting clients thinks that, on average, he drives the same distance each day of the week. He keeps track of his mileage for several weeks and discovers that he averages 122 miles on Mondays
|