(Answered) Pooling is used in calculating the standard error for the

Economics

Pooling is used in calculating the standard error for the difference between means when the population standard deviations are unknown, for which of the following reasons?

because the weighted average of the two sample variances gives a better estimate of the common population variance
because the weighted average of the two population variances gives a better estimate of the common sample variance
because the variances in the populations are assumed equal
because the null hypothesis usually shows there is no difference between the means

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