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Provide an example of when you might want to take a stratified random sample instead of a simple random

Provide an example of when you might want to take a stratified random sample instead of a simple randomChapter 7

A sportswriter wants to know how strongly the residents of Indianapolis, Indiana, support the local minor league baseball team, the Indianapolis Indians. He stands outside the stadium before a game and interviews the first 30 people who enter the stadium. Suppose that the newspaper asks you to comment on the approach taken by this sportswriter in performing the survey. How would you respond?

Question #C.3 page 309 Chapter 7

C.3. A large corporation has 4520 male and 567 female employees. The organization’s equal employment opportunity officer wants to poll the opinions of a random sample of employees. To give adequate attention to the opinions of female employees, exactly how should the EEO officer sample from the given population? Be specific.

Question #C.4 page 309 Chapter 7

C.4. Suppose that you want to estimate the mean monthly gross income of all households in your local community. You decide to estimate this population parameter by calling 150 randomly selected residents and asking each individual to report the household’s monthly income. Assume that you use the local phone directory as the frame in selecting the households to be included in your sample. What are some possible sources of error that might arise in your effort to estimate the population mean?

Question #C.5 page 309 Chapter 7

C.5. Provide an example of when you might want to take a stratified random sample instead of a simple random sample, and explain what the advantages of a stratified sample might be. C.6. Provide an example of when you might want.Question #C.2 Page 353 Chapter 8

When, if ever, is it appropriate to use the standard normal distribution as a substitute for the t distribution with n − 1 degrees of freedom in estimating a population mean?

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