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People were polled on how many books they read the previous year. Initial survey results indicate that s=15.2 books. Complete parts (a) through (d) below.

People were polled on how many books they read the previous year. Initial survey results indicate that s=15.2 books. Complete parts (a) through (d) below.

a) How many subjects are needed to estimate the mean number of books read the previous year within four books with 90% confidence?

(b) How many subjects are needed to estimate the mean number of books read the previous year within two books with 90% confidence?

c) What effect does doubling the required accuracy have on the samplesize?

(d) How many subjects are needed to estimate the mean number of books read the previous year within four books with 99% confidence?

Compare this result to part (a). How does increasing the level of confidence in the estimate affect samplesize? Why is thisreasonable?

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