Math 1431 – Spring 2003 – Test #4 – Practice
Question 3 Answers

First, using the stemplot program, check that each sample is approximately normal with no extreme outliers.

  1. Use 2–SampTTest. Let α = 0.05. The hypotheses are: H0: μ1 = μ2 and Ha: μ1 ≠ μ2. The P–value = 0.6753. Since P–value > α/2, we fail to reject H0.

  2. Use 2–SampTInt. The 95% CI for the mean of the 2 samples is –8.316 to 12.316.