A survey of the mean number of cents off that coupons give wasconducted by randomly surveying one coupon per page from the couponsections of a recent San Jose Mercury News. The following data werecollected: 20¢; 75¢; 50¢; 65¢; 30¢; 55¢; 40¢; 40¢; 30¢; 55¢; $1.50;40¢; 65¢; 40¢. Assume the underlying distribution is approximatelynormal.
Construct a 95% confidence interval for the population meanworth of coupons.  Use a critical value of 2.16 from thet distribution.
