Which of the following comparisons would use a “paired t-test”?
A- Fifteen retirees with diagnosed hypertension are assigned a program of diet, exercise, and meditation. A baseline measurement of blood pressure is taken before the program begins and again after 2 months. Was the program effective in reducing blood pressure of the participants after analyzing the mean blood pressure before the program compared to mean blood pressure after the program?
B- Comparing average GPA of male undergraduate students vs. average GPA of female undergraduate students
C- Comparing average age of juniors vs. average age of seniors.
D- Comapring the average GPA of economics majors, biology majors, and computer science majors.
Answer: A- Fifteen retirees with diagnosed hypertension are assigned a program of diet, exercise, and meditation. A baseline measurement of blood pressure is taken before the program begins and again after 2 months. Was the program effective in reducing blood pressure of the participants after analyzing the mean blood pressure before the program compared to mean blood pressure after the program?
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Write the fraction as a percent. If necessary, round the percentage to the nearest tenth.
A. 130% B. 29.6% C. 38.5% D. 3.8%
Solve. x - y + 4z = 44x + z = 0 x + 3y + z = -12
A. (0, 0, -4) B. (0, -4, 4) C. (0, -4, 0) D. (0, 4, -4)
Multiply. 
A. 1 B. 8 C. 7 D. 14
Use the rules of exponents to simplify the expression. Use positive exponents to write the answer.
A. 
B. 
C. x3
D. x2