The Weighted Average calculator computes the weighted average from two groups based on their averages (means) and group sizes.
INSTRUCTIONS: Enter the following:
Weighted Average: The calculator returns the weighted average of the two groups.
Related Calcs:
If you consider the following two groups:
If you take the average of the two means:
`(33.6 + 41.0)/2 = 37.3` you do not take into consideration that Group 1 had twice as many observations.
To compute the weighted average:
`WA = (10 * 33.6 + 5 * 41)/(10 + 5) = 36.066
This takes into account the larger size of Group 1.