What is the primary characteristic of a set of data for which the standard deviation is zero? (1) All values of the variable appear with equal frequency. (2) All values of the variable have the same...

What is the primary characteristic of a set of data for which the standard deviation is zero?

(1) All values of the variable appear with equal frequency.

(2) All values of the variable have the same value.

(3) The mean of the values is also zero.

(4) All of the above are correct.

(5) None of the above is correct.

Let X be the distance in miles from their present homes to residences when in high school for individuals at a class reunion. Then X is:

(1) a categorical (nominal) variable

(2) a continuous variable

(3) a discrete variable

(4) a parameter

(5) a statistic