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A researcher wanted to determine the mean number of hours per week (Sunday through Saturday) the typical person watches television. Results from the Sullivan Statistics Survey indicate that s = 7.5 hours.
(a) How many people are needed to estimate the number of hours people watch television per week within 2 hours with 95% confidence?
(b) How many people are needed to estimate the number of hours people watch television per week within 1 hour with 95% confidence?
(c) What effect does doubling the required accuracy have on the sample size?
(d) How many people are needed to estimate the number of hours people watch television per week within 2 hours with 90% confidence? Compare this result to part (a). How does
decreasing the level of confidence in the estimate affect sample size? Why is this reasonable?
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