Chapter 8: Q.1.2 (page 476)
Interpret the confidence level.
If the sampling procedure is repeated number of times than of the computed confidence interval are expected to contain the standard deviation of population.
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Going to the prom Tonya wants to estimate what proportion of the seniors in her school plan to attend the prom. She interviews an SRS of of the seniors in her school and finds that plan to go to the prom
The company’s customer satisfaction survey.
In the company’s prior-year survey, 80% of customers surveyed said they were “satisfied” or “very satisfied.” Using this value as a guess for pˆ, find the sample size needed for a margin of error of 3% at a 95% confidence level.
You have an SRS of observations from a Normally distributed population. What critical value would you use to obtain a confidence interval for the mean M of the population if S is unknown?
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(b)
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Rating dorm food Latoya wants to estimate what proportion of the seniors at her high school like the cafeteria food. She interviews an SRS of of the seniors living in the dormitory. She finds that think the cafeteria food is good.
56. The SAT again High school students who take the SAT Math exam a second time generally score higher than on their first try. Past data suggest that the score increase has a standard deviation of about points.
How large a sample of high school students would be needed to estimate the mean change in SAT score to within points with confidence? Show your work.
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