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2. The prices of used books at a large college bookstore are normally distributed. If a sample of 23 used books from this store has

2. The prices of used books at a large college bookstore are normally distributed. If a sample of 23 used books from this store has a mean price of $27.50 with a standard deviation of $6.75, calculate the following for a 95% confidence level about the population mean.

a. Degrees of freedom

b. The critical value oft

c. The margin of error

d. The confidence interval for a 95% confidence level

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