A standard deviation is equal to 5.50.This number means that the numbers in the sample deviate, on the average:
A) 2.25 units from the mean.
B) 5.50 units from each other.
C) 5.50 units from the mean.
D) 5.50 units from the two extreme scores.

Question

Quizplus · Accepted Answer

A standard deviation of 5.50 means that the numbers in the sample deviate, on average, 5.50 units from the mean. Choice A is incorrect because a deviation of 2.25 units would be too small for a standard deviation of 5.50. Choice B is incorrect because the standard deviation measures the deviation of each score from the mean, not from each other. Choice D is incorrect because the standard deviation measures the deviation of each score from the mean, not just the extreme scores.

A Standard Deviation Is Equal to 5