1)People were polled on how many books they read the previous year. Initial survey results indicate that s=13.4 books. Complete parts (a) through (d)

(a) How many subjects are needed to estimate the mean number of books read the previous year within four books with 95% confidence?

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

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

2)A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within

4points with 99 % confidence assuming s=15.8 based on earlier studies? Suppose the doctor would be content with 95 % confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires _

3)A survey was conducted that asked 1017 people how many books they had read in the past year. Results indicated that x with a line above =14.8 books and s=16.6. Construct a 90% confidence interval for the mean number of books people read. Select correct choice and fill in answers

a)If repeated samples are taken, 90% of them will have a sample mean between _ and _

b)There is a 90% chance that the true mean number of books read is between _ and _

c)There is 90% confidence that the population mean number of books read is between _ and _