Probability, Distributions, Correlation, Regression & Index Numbers — Practice

Question 1

A card is drawn from a well-shuffled pack of 52. The probability that it is a king or a heart is

Accepted Answer

B

Question 2

If two events A and B with non-zero probabilities are mutually exclusive, then they are

Accepted Answer

B

Question 3

For a binomial distribution with n = 20 and p = 0.3, the mean and variance are

Accepted Answer

A

Question 4

Two dice are thrown. The probability of getting at least one six is

Accepted Answer

B

Question 5

If the two regression coefficients are 0.8 and 0.45, the coefficient of correlation is

Accepted Answer

B

Question 6

The coefficient of correlation between two variables is

Accepted Answer

C

Question 7

Laspeyres price index uses which quantities as weights?

Accepted Answer

B

Question 8

The two regression lines are 2x + 3y = 10 and 4x + y = 12. The means of x and y are

Accepted Answer

A

Question 9

A study finds a correlation of 0.9 between ice cream sales and drowning incidents. The correct conclusion is

Accepted Answer

C

Question 10

A bag has 5 red and 3 black balls. Two are drawn without replacement. The probability that both are red is

Accepted Answer

B

Question 11

Fisher's index is called ideal because it

Accepted Answer

B

Question 12

A distribution has mean 4 and variance 4. It is most likely a

Accepted Answer

B

Question 13

In a normal distribution with mean 50 and standard deviation 10, approximately what percentage of observations lie between 30 and 70?

Accepted Answer

B

Question 14

For 10 pairs of ranks, Σd² = 44. The rank correlation coefficient is

Accepted Answer

A

Question 15

If r = 0.8, the percentage of variation in y NOT explained by x is

Accepted Answer

C

Practice — Probability, Distributions, Correlation, Regression & Index Numbers