The midpoints of intervals for frequency distributions constructed with interval-ratio variables are found by
A)adding the upper and lower class limits for each interval and then dividing by 2.
B)multiplying the upper and lower class limits for each interval.
C)dividing the range by 10.
D)None of the above.Class intervals for interval-ratio variables do not have midpoints.

Question

Quizplus · Accepted Answer

Midpoints for interval-ratio variables are found by adding the upper and lower class limits for each interval and then dividing by 2. This is because interval-ratio variables have a meaningful zero point and thus, it makes sense to find the average of the upper and lower limits of each interval to represent the midpoint of that interval.

The Midpoints of Intervals for Frequency Distributions Constructed with Interval-Ratio