I struggled with this problem please help!

3 Exercise 8-17 Algo 6 We use the t distribution to construct a confidence interval for the population mean when the underlying population standard deviation points is not known. Under the assumption that the population is normally distributed, find ta/2, af for the following scenarios. (You may find it useful to reference the t table. Round your answers to 3 decimal places.) ta/2, df Book a. A 951 confidence level and a sample of 22 observations. A 99% confidence level and a sample of 22 observations. c. A 951 confidence level and a sample of 14 observations. d. A 998 confidence level and a sample of 14 observations. References