Exam 28: Inference for Decision Making

During economic downturns, companies attempt to downsize their workforces by Offering early retirement incentives to older employees. A survey of 723 companies Found that 195 engage in such downsizing practices. The estimated proportion of Companies that downsize their workforces by offering early retirement incentives is

A local politician was interested in determining whether income level affects Opinion regarding the government's bailout bill for easing the 2008 financial crisis on Wall Street. He surveyed a sample of his constituents and got the following results. The Correct null hypothesis to be tested is Opinion Income Level Favor Oppose >\ 200,000 38 29 \ 50,000 to \ 200,000 30 42 <\ 50,000 32 59

A local politician was interested in determining whether income level affects Opinion regarding the government's bailout bill for easing the 2008 financial crisis on Wall Street. He surveyed a sample of his constituents and got the following results. The Calculated value of the Chi Square statistic is Opinion Income Level Favor Oppose >\ 200,000 38 29 \ 50,000 to \ 200,000 30 42 <\ 50,000 32 59

Absorption rates into the body are important considerations when manufacturing a generic version of a brand-name drug. A pharmacist read that the absorption rate into the body of a new generic drug $( \mathrm { G } )$ is the same as its brand-name counterpart (B). She has a researcher friend of hers run a small experiment to test $H _ { 0 } : \mu _ { G } - \mu _ { B } = 0$ against the alternative $H _ { A } : \mu _ { G } - \mu _ { B } \neq 0$ . Which of the following would be a Type I error?

Which of the following is not an assumption or condition that needs to be checked For a two-sample t-test for the difference between two means?