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- Statistics - Discussion
Statistics - Means Difference
The mean difference (more correctly, 'difference in means') is a standard statistic that measures the absolute difference between the mean value in two groups in a clinical trial. It estimates the amount by which the experimental intervention changes the outcome on average compared with the control.
Formula
Mean Difference=∑x1n−∑x2n
Where −
x1 = Mean of group one
x2 = Mean of group two
n = Sample size
Example
Problem Statement:
There are 2 dance groups whose data is listed below. Find the mean difference between these dance groups.
| Group 1 | 3 | 9 | 5 | 7 |
|---|---|---|---|---|
| Group 2 | 5 | 3 | 4 | 4 |
Solution:
∑x1=3+9+5+7=24∑x2=5+3+4+4=16M1=∑x1n=244=6M2=∑x2n=164=4MeanDifference=6−4=2
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