1. A sample of n = 9 scores has a standard error of 10 points. For the same population, what is the standard error for a sample of n = 25 scores? _______

QUESTION19

1. For a population with = 80 and = 10, what is the z-score corresponding to X = 65?

		+2.00
		-12.00
		-1.50
		-0.50

QUESTION 20

1. What is the relationship between the alpha level, the size of the critical region, and the risk of a Type I error?

		As the alpha level decreases, the size of the critical region decreases and the risk of a Type I error increases.
		As the alpha level decreases, the size of the critical region increases and the risk of a Type I error increases.
		As the alpha level decreases, the size of the critical region decreases and the risk of a Type I error decreases.
		As the alpha level decreases, the size of the critical region increases and the risk of a Type I error decreases.

QUESTION 21

1. A normal distribution has mean of = 50 with = 12. If one score is randomly selected from this distribution, what is the probability that the score will be between 53 and 80?

________