1) Assume that the international average homicide victimization rate is 2.92 (per 100,000). In a sample of 24 industrialized nations, LaFree and Drass (2002) found that the mean homicide victimization rate was 1.49 (per 100,000; standard deviation = 0.44). Perform a hypothesis test to determine if the mean homicide rate in industrialized nations is different than the international average. Use a 0.05 level of statistical significance.
What is the alternative hypothesis?
2) We know that, on average, most people drive about 10 miles a day. We think that people living in Phoenix have a different average than this. We talk to 250 people that live Phoenix, and find that their average number of miles they drive per day is 15, with a standard deviation of 3.7. Conduct a hypothesis test to see if people in Phoenix drive a different amount; use a significant level of 0.05.
What is the alternative hypothesis?