Question: We use the t distribution to construct a confidence interval for the population mean when the underlying population standard deviation is not known. Under the

We use thetdistribution to construct a confidence interval for the population mean when the underlying population standard deviation is not known. Under the assumption that the population is normally distributed, findt_/2,dffor the following scenarios.(You may find it useful to reference thet table.Round your answers to 3 decimal places.)

a. A 90% confidence level and a sample of 9 observations. _____

b. A 95% confidence level and a sample of 9 observations. _____

c. A 90% confidence level and a sample of 27 observations. _____

d. A 95% confidence level and a sample of 27 observations. _____

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