Question

People were poled on how many books they read the previous year. Initial survey resuits indicate that s 10.6 books. Complete parts (a) through (d) below Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within four books with 90% confidence? This 90% confidence level requires L sub ects (Round up to the nearest subject ) (b) How many subjects are needed to estimate the mean number of books read the prevous year within two books with 90% confidence? This 90% confidence level requires L] subjects. (Round up to the nearest subject ) (c) What effect does doubling the required accuracy have on the sample size? OA. Doubling the required accuracy nearty quadruples the sample size O B. Doubling the required accuracy nearly doubles the sample size. с. Doubling the requred accuracy nearly halves the sample size. O D. Doubling the required accuracy nearly quarters the sample size (d) How many subjects are needed to estimate the mean rumber of books read the previous year within four books wit 99% orfence? This 99% confidence level requires subets (Round up to the nearest subject ) Compare this resuit to part (a). How does increasing the level of confidence in the estimate aflect sample size? Why is this reasonable? O A Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidence can be achieved with a larger sample size о в ncreasing the level of confidence increases the sample size required For a fixed margn of eror greater confidence can be achieved with a smaller sample sze OC. Increasing the level of confisence decreases the sample sze required. For a fxed margin of error, greater confisence can be acheved with a larger sample size ○ D. Increasing the level of confidence decreases the sample sze required For a fixed margin of error, geater cofidence can be achieved wth a smaler sample size

Answer 1

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