Answer :
The formula for estimating the population variance from the sample requires calculating the sum of squared deviations and dividing it by the number of observations. This is true for both the t-test for dependent means and the t-test for independent means.
This formula is referred to as the "variance sum of squares"or the t-test for dependent means, the formula is:
Where:
x1 = observation 1
x2 = observation 2
N = number of observations
For the t-test for independent means, the formula is:
Sample Variance = [(Σx12)/N + (Σx22)/N]/2
Where:
x1 = observation 1
x2 = observation 2
N = number of observation
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