21. For a sample with M = 80, a score of X = 88 corresponds to z = 2.00. What is

Question

21. For a sample with M = 80, a score of X = 88 corresponds to z = 2.00. What is the sample standard deviation?

a. 2

b. 8

c. 16

d. 4

22. For a sample with a mean of M = 50 and a standard deviation of s = 10, a z-score of z = +2.00 corresponds to X = 70.

False

True

23.   Which of the following z-score values represents the location closest to the mean?

A.   z = +0.50

b.   z = –1.00

c.   z = –2.00

d.   z = +1.00

24. For a sample with M = 50 and s = 8, z = 1.50 corresponds to X = 65.

True

False

25. In a distribution with s = 20, a score that is above the mean by 10 points will have a z-score of z = 0.50.

True

False

Explanation / Answer

21 .d - s = 4.

22 true

23. A

24. false.

25 true

for all the above questions to solve we have to apply the formulae Z = (X - M ) / s

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