Solve

Examples Recitation 13 Worksheet 1. Compute to/2,af for a = 0.05 using 2, 5, and 50 degrees of freedom in both t table and R(Round your answers to 3 decimal places) df=2 df=5 df=50 2. Let the following sample of 8 observations be drawn from a normal population with unknown mean and standard deviation: 22, 18, 14, 25, 17, 28, 15, 21. (Round your answers to 2 decimal places.) a. Calculate the sample mean and the sample standard deviation. S = VS2 = E ( X 1 - X) ? b. Construct the 90% confidence interval for the population mean. T ta/2, of Vn c. Without any computation, explain how the value of margin of error will change (increase or decrease) as the confidence level increases from 90% to 95%. d. Without any computation, explain how the value of margin of error will change (increase or decrease) as the sample size increases from n = 8 to n = 20