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What percent of the data are below the Z score of 0?


A) 0%
B) 10%
C) 50%
D) 100%

E) B) and D)
F) All of the above

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In what units are Z scores calculated?


A) In units of standard deviation
B) In units of standard error
C) In units of range
D) In units of the mean

E) A) and D)
F) None of the above

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A

On the normal distribution, the Z score of 1 marks 84.13% under the curve. Which of the statement is NOT true?


A) 84.13% of the data are under the Z score of 1
B) 15.87% of the data are above the Z score of 1
C) The Z score of 1 shows the 84.13 percentile score
D) The Z score of 1 shows the 15.87 percentile score

E) A) and B)
F) A) and C)

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D

Suppose a sample has a mean of 15 and standard deviation of 5. What is the Z score of a score of 20?

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Z score = 1 (Z score = [20-15)/5]

What does a Z score of 1 mean?


A) The score is 1 point above the mean
B) The score is 1 standard deviation above the mean
C) The score is 1 standard deviation below the mean
D) The score is 1

E) B) and D)
F) None of the above

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