25. You are estimating the population mean and the standard deviation of the population is NOT known. Which distribution do you use in the confidence interval formula? a. Use a Z distribution. b. Use a t distribution with 30 degrees of freedom. c. Use a t distribution with n-1 degrees of freedom. d. Use at distribution with n degrees of freedom.

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25. You are estimating the population mean and the standard
deviation of the population is NOT known. Which
distribution do you use in the confidence interval formula?
a. Use a Z distribution.
b. Use at distribution with 30 degrees of freedom.
c. Use at distribution with n-1 degrees of freedom.
d. Use a t distribution with n degrees of freedom.
с.
Transcribed Image Text:25. You are estimating the population mean and the standard deviation of the population is NOT known. Which distribution do you use in the confidence interval formula? a. Use a Z distribution. b. Use at distribution with 30 degrees of freedom. c. Use at distribution with n-1 degrees of freedom. d. Use a t distribution with n degrees of freedom. с.
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