When computing the standard deviation from grouped data,the sum of the deviations is approximated by using the ____ of the intervals.
A)midpoints
B)lower real limits
C)upper real limits
D)all of the above

Question

Quizplus · Accepted Answer

When computing the standard deviation from grouped data, it is common to use the midpoints of the intervals as an approximation for the data points. This is because using the lower or upper real limits can result in some bias in the calculation. Therefore, choice A (midpoints) is the best option.

When Computing the Standard Deviation from Grouped Data,the Sum of the Deviations