1. Newton County and Fulton County use two different procedures for selecting jurors. The mean waiting time for the 40 randomly selected subjects from Newton County is 183.0 minutes with a standard deviation of 21 minutes. The mean waiting time for the 50 randomly selected subjects from Fulton County is 253.1 minutes with a standard deviation of 29.2 minutes. We want to know if the mean waiting time of prospective jurors differs in the two counties.
   1. What are the null and alternative hypotheses?
   2. Are these samples dependent or independent?
2. In a study to determine the strength of a basic back kick and a reverse high punch in karate, data were collected from 10 black belt subjects, each doing a kick and a punch. We wish to test the claim that there is no significant difference in the two as far as strength when executed by an expert.
   1. What are the null and alternative hypotheses?
   2. Are these samples dependent or independent?
3. A study of people with obsessive-compulsive disorder included a measurement of the volume of the brain by x-ray tomography, with the intention of determining whether brain volumes for people who are obsessive-compulsive are larger than those without. Brain volumes for a sample of 10 neurotypical persons and for a sample of 10 obsessive-compulsive persons were obtained. Obsessive-compulsive (OC): mean=1390.03, s=156.84. Neurotypical (NT): mean=1268.4, s=137.97.
   1. What are the null and alternative hypotheses?
   2. Are these samples dependent or independent?