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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 Statistic Survey I 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 hours with 95% confidence?
c)What effect does doubling the 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 results from (a). How does decreasing the level of confidence in the estimate affect sample size? Why is the reasonable?
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