While writing an article upon the high cost of college education, a reporter took random sample of cost of new textbooks for semester. The random variable x is the cost of one book. Her sample data can be summarized by following. (Provide your answers correct to two decimal places.)
n = 23, ?x = 3689.6, and ?(x - x)2 = 9871.4
(a) Determine the sample mean, x.
$
(b) Determine the sample standard deviation, s.
$
(c) Determine the 98% confidence interval to estimate the true mean textbook cost for the semester based on this sample.
Lower Limit $
Upper Limit $