People were polled on how many books they read the previous year. Initial survey results indicate that s = 17.2 books. Complete parts (a) through (5) below a Click the icon to view a partial table of ,critical values. _ _~-_ (3) How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% condence? This 95% condence level requires El subjects. (Round up to the nearest subject.) (b) How many subjects are nee This 95% condence level requi Partial critical value table Level of Condence, a Critical Value, 201/2 (1 -05). 100% Area in Each Tail, -2- 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 .@