2005 What critical value t from Table C would you use for a

(20.05) What critical value t* from Table C would you use for a confidence interval for the mean of the population in each of the following situations?

A 95 % confidence interval based on n = 20 observations.

1.066

An 90 % confidence interval from a sample of size 7.

Solution

For 95 % confidence interval based on n = 20 observations , the critical value t is 2.093

For 90% confidence interval based on n = 7 observations , the critical value t is 1.943