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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Mrs. Rodrigues wants to compare the spread of the test scores of her two biology classes. Which statistic should she use?
A
meanB
standard deviationC
medianD
mode3
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.4
Fiona recorded the number of miles she biked each day last week as shown below.4, 7, 4, 10, 5The mean is given by m = 6. Which equation shows the variance for the number of miles Fiona biked last week?
A
s squared = StartFraction (4 minus 6) squared + (7 minus 6) squared + (4 minus 6) squared + (10 minus 6) squared + (5 minus 6) squared Over 6 EndFraction
B
Sigma = StartRoot StartFraction (4 minus 6) squared + (7 minus 6) squared + (4 minus 6) squared + (10 minus 6) squared + (5 minus 6) squared Over 5 EndFraction EndRoot
C
s = StartRoot StartFraction (4 minus 6) squared + (7 minus 6) squared + (4 minus 6) squared + (10 minus 6) squared + (5 minus 6) squared Over 4 EndFraction EndRoot
D
Sigma squared = StartFraction (4 minus 6) squared + (7 minus 6) squared + (4 minus 6) squared + (10 minus 6) squared + (5 minus 6) squared Over 5 EndFraction
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