Question

A survey was conducted that asked 1006 people how many books they had read in the past year. Results indicated that x = 12.7 books and s= 16.6 books. Construct a 90% confidence interval for the mean number of books people read. Interpret the interval. Click the icon to view the table of critical t-values. Construct a 90% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to two decimal places as needed.) O A. If repeated samples are taken, 90% of them will have a sample mean between and OB. There is 90% confidence that the population mean number of books read is between and O C. There is a 90% probability that the true mean number of books read is between and

Answer 1

x = 12.7 s = 16.6 ha loob 1 - 2 = 0.90 2 = 0.lo d. = 0.05 2 Zoos tin-1), 21 2² 1oo50.05 = 1.65 (by table) Now. C.E for u- X I ten-12, "/2 5 h 12.7 I toos, o.os X 16.6 Sloob 12.7 ± 1.65 x 16.6 Sloob 12. + 0.86 Please like 11.84 L M L 13.56 There is qox. confidence that Pop," mean No. of books (b) read is 11.84 to 13.56. TIE