Deck 15: Z-Score

Question 1

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

Answer 1

A

Question 2

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

Answer 2

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

Question 3

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

Answer 3

B

Question 4

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

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

Question 5

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