X and Y are two categorical variables. The best way to determine if there is an
ID: 3226211 • Letter: X
Question
X and Y are two categorical variables. The best way to determine if there is an association between them is to a. draw a scatterplot of the X and Y values, then obtain the linear correlation coefficient r if the observed relationship is linear. b. a two-way table of the X and Y values and compute the marginal distributions. c create a two-way table of the X and Y values and compute the conditional distributions. d perform all these suggested analyses. Sickle-cell disease is a painful disorder of the red blood cells that in the United States affects mostly African Americans. To investigate whether the drug hydroxyurea can reduce the pain associated with sickle-cell disease, a study by NIH gave the drug to 150 sickle-cell suffers and the place be to another 150. Neither doctors nor patients were told received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of a. an observational study. b. an experiment. c. convenience sampling. d multistage sampling A health club is interested in finding out which of two brands of aerobic exercise equipment provides a more vigorous workout. They purchase 10 machines of each type and, for five days between 9 A.M., and 12 PM. measure the average pulse rate of each person who is working out on one of these 20 machines. This is an example of a(n) a. experiment. b. observational study. c. paired data experiment. d. stratified experiment. At a local health club, a researcher samples 75 people whose primary exercise is cardiovascular and 75 people whose primary exercise is strength training. The researcher's objective is to assess the effect of type of exercise on cholesterol. Each subject reported to a clinic to have his or her cholesterol measured. The subjects were unaware of the purpose of the study, and the technician measuring the cholesterol was not aware of the subject's type of exercise. This is a(n) a. observational study. b. experiment, but not a double-blind experiment. c. double-blind experiment. d. matched pairs experiment. A study is interested in opinions about stem cell research. A random sample of U.S. residents is selected, and they are asked questions about stem cell research. The study then compares the responses of men and women in the sample. The overall sample is a a. simple random sample. b. stratified sample. c. voluntary response sample. d. designed experiment. The city council in a suburb of Raleigh is interested in the level of public support for a tax increase to support restoration of nearby parks and waterways. A marketing research firm is selected that then selects a simple random sample of 50 adult residents and contacts each to determine whether the resident would be opposed to the tax increase. Of these, 15 indicated that they would be opposed.Explanation / Answer
SOlving one question as per Chegg policy, kindly repost the rest individually.
Q 25) The starting point for analyzing the relationship between two categorical variables is to create a two-way contingency table. The correct answer is C. Make a two-way table and create a conditional distribution.
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