Take the formula Z = (X - )/, where is the mean of the population, X is the value of the element, Z is the z-score and is the standard deviation. What does this formula calculate?

A. Confidence interval.

B. Standard score.

C. Standard error of the mean.

D. Variance.

What is the variance for the following set of scores: 2, 2, 2, 2, 2.

A. 0

B. 2

C. 4

D. 25

What is the correct decision in a hypothesis if the data produce a t-statistic that is in the critical region?

A. Reject H0

B. Fail to reject H0

C. Reject H1

D. Fail to reject H1

A _____________________ variable is a variable whose values can theoretically take on an infinite number of values within a given range of values.

A. Continuous

B. Discrete

C. Random

D. Both (a) and (b)