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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 the t distribution 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, find t/2,df for the following scenarios. (You may find it useful to reference the t table. Round your answers to 3 decimal places.)

t/2,df
a. A 95% confidence level and a sample of 26 observations.
b. A 99% confidence level and a sample of 26 observations.
c. A 95% confidence level and a sample of 18 observations.
d. A 99% confidence level and a sample of 18 observations.

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