Assume that you are going to calculate a confidence interval to estimate a population mean. For each of the following cases, state the degrees of freedom and the appropriate critical value (*)

Case sample size confidence level Degrees of freedom t*

1 16 90% ________ ________

2 16 95% ________ ________

3 30 95% ________ _________

4 30 99% ________ _________

5 130 95% ________ __________