Try to convince me to leave England and come to Massachusetts by providing three reasons why and one reason why I should not stay in London.

where 0 refers to controls and 1 to treatments, so that there are n 1 treatments and n 0 controls, and Ӯ 1 and Ӯ 0 are the two means. As has long been known, the "t-statistic' based on is not distributed as Student's t if the two variances (treatment and control) are not identical but has the Behrens-Fisher distribution. In extreme cases, when one of the variances is zero, the t.

reasons Try to convince me to leave England and come to Massachusetts by providing three reasons why and one reason why I should not stay in London.

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couples could only have one child to reduce the population growth.