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State whether each situation has independent or paired (dependent) samples. a. A researcher wants to know whether blood pressures of people go down after light reading. She measures the blood pressures of a random sample of people before reading and then collects their blood pressures after reading. b. A researcher wants to know whether professors with tenure have fewer graduate students than professors without tenure. She observes the number of graduate students for tenured and untenured professors. a. Choose the correct answer below. O A. The samples are independent because the observations in one group are not paired or matched with observations in the other group. In this situation, different people were used in the two samples and the two groups are not related. O B. The samples are paired because each observation in one group is coupled with one particular observation in the other group. In this situation, each person's measurements before and after reading are matched. O C. The samples are independent because each observation in one group is coupled with one particular observation in the other group. In this situation, each person's measurements before and after reading are matched. O D. The samples are paired because the observations in one group are not paired or matched with observations in the other group, In this situation, different people were used in the two samples and the two groups are not related. b. Choose the correct answer below. O A. The samples are paired because each observation in one group is coupled with one particular observation in the other group. In this situation, each professor's graduate students before and after getting tenure are matched. O B. The samples are independent because the observations in one group are not paired or matched with observations in the other group. In this situation, different professors were used in the two samples and the two groups are not related. O C. The samples are paired because the observations in one group are not paired or matched with observations in the other group. In this situation, different professors were used in the two samples and the two groups are not related. D. The samples are independent because each observation in one group is coupled with one particular observation in the other group. In this situation, each professor's graduate students before and after getting tenure are matched