7.57 More basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.

1. (a) A significance test for comparing two means gave with 10 degrees of freedom. Can you reject the null hypothesis that the μ’s are equal versus the two-sided alternative at the 5% significance level?

2. (b) Answer part (a) for the one-sided alternative that the difference between means is negative.