QBA 237 18.1 By Hand Homework - Hypothesis tests

1. The median price of homes in Austin, Texas is $248,640 (AustinHomeSearch website, April 2015). A sample of 200 homes sold in the south Austin suburb of Westlake Hills found 111 homes with sales prices over $248,640 and 89 homes with sales prices under $248,640. Can you conclude that the median price of homes in Westlake Hills differs from the median price of homes in Austin? Use a = 0.05.

5. In a nearby county, St. Catherine, the law states that anyone with a median blood alcohol concentration of 0.20 or higher will be put in jail immediately for 14 days without a trial if that person is caught driving while intoxicated. In this county, the blood alcohol concentrations of 21 drivers involved in fatal accidents and then convicted with jail sentences are given below. A deputy at the jail wants to determine if the true median blood alcohol concentration is 0.20 vs. an alternative that the true median blood alcohol concentration is higher than 0.20. Do not assume normality. Let a = 0.05.

0.17 0.23 0.17 0.16 0.13 0.14 0.19 0.24 0.14 0.16 0.22 0.16 0.21 0.17 0.18 0.16 0.21 0.13 0.18 0.22 0.20