(20 points) For each part, select the best choice. Remaining time: 43:50 (min'sec) (a) An experiment involved the response variable resting pulse rate and the explanatory variable diet (low-sodium; standard). For subjects under the age of thirty, it was found that resting pulse rates were the same for the two groups. However, for subjects age thirty or older, the study showed that resting pulse rates were lower for subjects on the lowsodium diet. This information suggests that age (under 30 years; 30 years or older) 0 A. is confounded with diet (low-sodium; standard). 0 B. is an interval variable 0. interacts with diet (low-sodium; standard). 0 D. is confounded with resting pulse rate. Q E. All of the above. (b) A study was conducted in order to compare the ages of two groups: Mizzou sophomores and UMSL sophomores. The Explanatory variable is O A. GROUP (Mizzou sophomores or UMSL sophomores). O B. RESIDENCE (on-campus or off-campus) O C. Age. 0 D. Whether or not a student owns a car. 0 E. None of the above. Note: You can earn partial credit on this problem. preview answers