Which of the following is a machine designed to record the brain wave patterns produced by electrical activity of the brain?

Describing the chances that low-ability test takers will obtain each score is called the

a. dichotomous format. b. polytomous format. c. guessing threshold. d. 50% threshold.

If a score is equal to the mean, its Z score will be a. < 0

b. exactly 0. c. > 0. d. impossible to calculate.