In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not In the Student's t table, use the closest d.f. that Is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. At five weather stations on Trail Ridge Road In Rocky Mountain National Park, the peak wind gusts (in miles per hour) for January and April are recorded below. Weather Station 2 3 4 5 January 137 120 128 64 78 April 104 113 102 88 61 LA USE SALT Does this information indicate that the peak wind gusts are higher In January than In April? Use a = 0.01. (Let d = January - April.) (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-talled, right-tailed, or two-tailed test? O Ho: Ha = 0; H1: Ha * 0; two-tailed O Ho: Ha = 0; H1: My 0; right-tailed O Holla > 0; Hit My = 0; right-tailed (b) What sampling distribution will you use? What assumptions are you making? The standard normal. We assume that d has an approximately normal distribution. O The Student's t. We assume that d has an approximately uniform distribution. O The standard normal. We assume that d has an approximately uniform distribution. The Student's t. We assume that d has an approximately normal distribution. What is the value of the sample test statistic? (Round your answer to three decimal places.)