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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. The western United States has a number of four-lane interstate highways that cut through long tracts of wilderness. To prevent car accidents with wild animals, the highways are bordered on both sides with 12-foot-high woven wire fences. Although the fences prevent accidents, they also disturb the winter migration pattern of many animals. To compensate for this disturbance, the highways have frequent wilderness underpasses designed for exclusive use by deer, elk, and other animals. In Colorado, there is a large group of deer that spend their summer months in a region on one side of a highway and survive the winter months in a lower region on the other side. To determine if the highway has disturbed deer migration to the winter feeding area, the following data were gathered on a random sample of 10 wilderness districts in the winter feeding area. Row B represents the average January deer count for a 5-year period before the highway was built, and row A represents the average January deer count for a 5-year period after the highway was built. The highway department claims that the January population has not changed. Test this claim against the claim that the January population has dropped. Use a 5% level of significance. Units used in the table are hundreds of deer. (Let d = B- A.) Wilderness District 2 3 5 6 7 8 9 10 B: Before highway 101 12 129 56 174 9.9 20.5 162 18 9 11.6 A: After highway 91 84 10.2 40 7 15.2 8.3 12.2 73 LO USE SALT (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O Hold=0; Hild# 0; two-tailed O Hold= 0; Hi: H 0; right-tailed O Holla> 0; Hy: H d= 0; right-tailed (b) What sampling distribution will you use? What assumptions are you making? The Student's t. We assume that d has an approximately uniform distribution. The standard normal. We assume that d'has an approximately uniform distribution. O The standard normal. We assume that d'has an approximately normal distribution. O The Student's t. We assume that dhas an approximately normal distribution. What is the value of the sample test statistic? (Round your answer to three decimal places.) (c) Find (or estimate) the P-value. (Round your answer to four decimal places.) O Pvalue > 0.250 O 0.125
