ving cases, determine whether the sampling is dependent or independent: a. In a test of manual dexterity, volunteers are asked to twist a small rod with either their dominant hand or their non-dominant hand (selected at random). Then they repeat the procedure with their other hand. The purpose of the test is to determine which hand can spin the rod faster. b. A person's protein requirement is the amount of protein they must consume in a day to maintain a stable weight, muscle mass, etc. A group of researchers wanted to know if the protein requirement of young adults is the same as the protein requirement of elderly adults. The protein requirements of 21 young and 19 elderly volunteers were determined. (Source: Campbell, et. al., Dietary protein requirements of younger and older adults. American Journal of Clinical Nutrition. 2008.) c. A group of fifth graders at Eastside Elementary School were randomly divided into two groups. Students in Group A were given a traditional presentation on the dangers of drug use. Students in Group B received a traditional drug abuse prevention presentation, but they also took a field trip to the county jail. At the end of the unit, the students were asked to indicate on a scale of 1 to 100, the likelihood that they would ever use illegal drugs. School officials wanted to assess the effectiveness of the field trip as a drug abuse prevention tool. d. A group of seventh graders at Jefferson Middle School were given a presentation on the dangers of drug use. Both before and after the presentation, the students were asked to indicate (on a scale of 1 to 100) the likelihood that they would ever use illegal drugs in the future. School accoce the effectiveness of the presentation as a drug abuse prevention tool.