People were polled on how many books they read the previous year. Initial survey results indicate that s=14.6 books.

1. How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% confidence? (Round up to the nearestsubject.)

2. How many subjects are needed to estimate the mean number of books read the previous year within three books with 95% confidence? (Round up to the nearestsubject.)

3. What effect does doubling the required accuracy have on the samplesize? Choose one

A) Doubling the required accuracy nearly quarters the sample size.

B) Doubling the required accuracy nearly quadruples the sample size.

C) Doubling the required accuracy nearly doubles the sample size.

D) Doubling the required accuracy nearly halves the sample size.

4) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? (Round up to the nearestsubject.)

Compare this result to part (1) . How does increasing the level of confidence in the estimate affect samplesize? Why is thisreasonable? Pick one

A) Increasing the level of confidence increases the sample size required. For a fixed margin oferror, greater confidence can be achieved with a smaller sample size.

B) Increasing the level of confidence decreases the sample size required. For a fixed margin oferror, greater confidence can be achieved with a larger sample size.

C) Increasing the level of confidence increases the sample size required. For a fixed margin oferror, greater confidence can be achieved with a larger sample size.

D) Increasing the level of confidence decreases the sample size required. For a fixed margin oferror, greater confidence can be achieved with a smaller sample size.