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Description: 1. In the following situations, indicate whether you’d use the normal distribution, the t distribution, or neither.
a. The population is normally distribut., and you know the population standard deviation. b. You don’t know the population standard deviation, and the sample size is 35. c. The sample size is 22, and the population is normally distributed. d. The sample size is 12, and the population is not normally distributed. e. The sample size is 45, and you know the population standard deviation.

  1. The prices of us. books at a large college bookstore are normally distributed. If a sample of 23 used books from this store has a mean price of S27.50 with a standard deviation of S6.75, use Table 10.1 in your textbook to calculate the following for a 95% confidence level about the population mean. Be sure to show your work.
    a. Degrees of freedom b. The critical value of t c. The margin of error d. The confidence interval for a 95% confidence level

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