Part b

m el ola People were polled on how many books they read the previous year. Initial survey results indicate that s = 12.1 books. Complete parts (a) through (d) below. to 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? pic This 90% confidence level requires 25 subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within two books with 90% confidence? wal This 90% confidence level requires subjects. (Round up to the nearest subject.) C p als am I p Is I and nter and uals Iniqu d be on fo and ne in