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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

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, findt2,df for the following scenarios.UseTable 2.(Round your answers to 3 decimal places.)

t/2,df
a. A 95% confidence level and a sample of 16 observations.
b. A 90% confidence level and a sample of 16 observations.
c. A 95% confidence level and a sample of 7 observations.
d. A 90% confidence level and a sample of 7 observations.

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