Standard Deviation Answers
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A set of data has a mean of 12 and a standard deviation of 3. A data point of the set has a z-score of 1.3. What does a z-score of 1.3 mean?
A
The data point is 1.3 standard deviations away from 3B
The data point is 1.3 standard deviations away from 12.C
The data point is 3 standard deviations away from 1.3.D
The data point is 3 standard deviations away from 12.2
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Yuri computes the mean and standard deviation for the sample data set 12, 14, 9, and 21. He finds the mean is 14. His steps for finding the standard deviation are below.What is the first error he made in computing the standard deviation?
A
Yuri failed to find the difference between each data point and the mean.B
Yuri divided by n instead of n -1.C
Yuri did not subtract 9 - 14 correctly.D
Yuri failed to square -2 correctly.3
A set of data has a mean of 0.5 and a standard deviation of 0.01. A data point of the set has a z-score of 2.5. What does a z-score of 2.5 mean?
A
The data point is 0.01 standard deviations away from 2.5.B
The data point is 0.01 standard deviations away from 0.5C
The data point is 2.5 standard deviations away from 0.01.D
The data point is 2.5 standard deviations away from 0.5.
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