If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations,the sample standard deviations are pooled to compute the best estimated variance.

Question

Quizplus · Accepted Answer

This statement is true. When the two population standard deviations are assumed to be equal but unknown, the sample standard deviations are pooled to compute the best estimated variance, which is used in calculating the t statistic for hypothesis testing. This approach is known as the pooled variance method.

If We Are Testing for the Difference Between Two Population