(02.04 LC)  For a certain experiment, the available experimental units are six people: three females (f) and three males (m). Use (1f, 2f, 3f) to denote the females and (1m, 2m, 3m) to denote the males. There are to be three treatment groups: A, B, and C. If a randomized block design is used, with the experimental units blocked by gender, which assignment of treatments is not correct? (5 points)

(02.05 LC)  A researcher is studying the effects of playing chess on memory improvement. He identifies 50 people who play chess and 50 people who do not. Each of the 100 people is given a questionnaire designed to determine memory level. None of the 100 people who participated in the study knew they were part of a study. Which statement is true? (5 points)

(02.05 MC)  You want to know the opinions of home-schooled students across America on whether they prefer to learn at home versus at a public school with other students. You obtain a list of all home-schooled students and mail a survey to a random sample of 7,500 students. Of those, 4,195 responded and 39% say they prefer to learn at home. Which of the following statements is true? (5 points)

Which structures are elements of adaptive immunity?

(01.02 LC)  A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0 Second period: 3, 2, 3, 1, 3, 4, 2, 4, 3, 1, 0, 2, 3, 1, 2 Third period: 4, 5, 3, 4, 2, 3, 4, 1, 8, 2, 3, 1, 0, 2, 1, 3 Which is the best measure of center for second period and why? (5 points)

(03.04 MC)  Given P(X) = 0.5, P(Y) = 0.4, and P(Y|X) = 0.3, what are P(X and Y) and P(X or Y)? (5 points)

(01.02 MC)  For which of the following distributions is the mean most likely to be relatively equal to the median? (5 points)

(02.04 MC)  You are interested in determining which of two brands of light bulbs, brand A and brand B, lasts longer under differing conditions of use. Fifty Bovano lamps are fitted with brand A light bulbs and 50 Bulbrite lamps are fitted with brand B light bulbs. Each light bulb is left on for 20,000 hours straight. Light bulb life is then measured for each bulb, and the average light bulb life for the two brands is compared. What is wrong with this experimental design? (5 points)

(01.02 LC)  A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0 Second period: 3, 2, 3, 1, 3, 4, 2, 4, 3, 1, 0, 2, 3, 1, 2 Third period: 4, 5, 3, 4, 2, 3, 4, 1, 8, 2, 3, 1, 0, 2, 1, 3 Which is the best measure of center for third period and why? (5 points)

(02.05 MC)  A hospital gives a survey to all surgical patients asking them to rate the quality of their hospital experience. One month after surgery, the hospital contacts the patients again to ask if there were any complications from the surgery. Last year, the results of the surveys showed that of the patients who had a poor hospital experience, 40% had post-surgical complications. What conclusion can be drawn from this study? (5 points)