To look at variability in a group, a researcher with interval level data would use
A) quartile deviation .
B) range.
C) standard deviation.
D) standard score.

Question

To look at variability in a group, a researcher with interval level data would use
A) quartile deviation	.
B) range.
C) standard deviation.
D) standard score.

Quizplus · Accepted Answer

Standard deviation is the best choice as it measures the amount of variability or dispersion around the mean in a set of data. It is a commonly used measure of variability for interval level data. Quartile deviation and range are also measures of variability, but they are less precise than standard deviation. Standard score (also known as z-score) is a measure of how many standard deviations a value is from the mean, and is not a measure of variability in a group.

To Look at Variability in a Group, a Researcher with Interval