Z-Score Quiz

What does a z-score tell you?

• The range of the data

• The mean of the data

• The standard deviation of the data

• How many standard deviations a data value is from the mean

What does a positive z-score indicate?

• The data value is equal to the mean

• The data value is below the mean

• The data value is within one standard deviation of the mean

• The data value is above the mean

If the mean is 24 and the standard deviation is 5, what is the z-score for a data value of 20?

• -1.5

• 3.6

• 1.2

• -0.8

How is the z-score calculated?

• By adding the mean to the data value

• By subtracting the mean from the data value and dividing by the standard deviation

• By multiplying the mean with the data value

• By dividing the data value by the standard deviation

What does a negative z-score indicate?

• The data value is equal to the mean

• The data value is above the mean

• The data value is within one standard deviation of the mean

• The data value is below the mean

What is the z-score for a data value that is 1 standard deviation below the mean?

• -1

• 0.5

• -2

• -0.5

Calculate a z score for a data value of 12 if the mean is 10 and the standard deviation is 5

• .4

• .8

• 1.2

• -.4

For a test with a mean score of 81 and a standard deviation of 5, your score is 78. How would you use the z-score formula to find the standardized score, z?

a

b

c

d

-0.6

5

81

78

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