Statistics & Probability

Question 1

MULTIPLE CHOICE. Suppose that the correlation between two variables, x and y, is Corr(x,y) = -0.72. What does this number suggest?

A. A strong positive linear relationship between the variables.

B. A strong negative linear relationship between the variables.

C. A weak positive linear relationship between the variables.

D. That as the value of x increases, the value of y increases.

Answer 1

B

Question 2

MULTIPLE CHOICE. Suppose that the covariance between two variables, x and y, is negative. What does this information tell you? A. That as the value of x increases, the value of y decreases. B. That as the value of x decreases, the value of y decreases. C. That as the value of x increases, the value of y increases. D. That as the value of x increases, the value of y remains unchanged.

Answer 2

B

Question 3

MULTIPLE CHOICE. Which of the following statement about measures of dispersion is false? A. The smallest possible value for the variance is zero. B. The units of the variance are squared units of the original data. C. The units of the standard deviation are squared units of the original data. D. Large standard deviation indicates large data dispersion

Answer 3

C

Question 4

If you toss a die, what is the probability that 3 is not the number that appears on the die?

Answer 4

5/6