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While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textbooks for a semester. The random variable x is the cost of one book. Her sample data can be summarized by the following. (Give your answers correct to two decimal places.) n = 30, Σx = 3594.6, and Σ(x - x)2 = 9778.4

(a) Find the sample mean, x.

(b) Find the sample standard deviation, s.

(c) Find the 99% confidence interval to estimate the true mean textbook cost for the semester based on this sample.

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Upper Limit

Reference no: EM13615198

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