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An irate student complained that the cost of his statistics textbook was too high. He randomly...

An irate student complained that the cost of his statistics textbook was too high. He randomly surveyed 37 students and found that the mean amount of money spent on statistics textbooks for these students is $122 with a standard deviation of $7.

(a) Construct a 95% confidence interval for the actual average cost of statistics textbooks.

(b) A statistics professor claims that the average cost of the textbook for her statistics class is $105. What would you tell her?

Math   Statistics-And-Probability   
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