In: Statistics and Probability
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 tα/2,df for the following scenarios. (You may find it useful to reference the t table. Round your answers to 3 decimal places.)
tα/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. | |