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    Minimum control size for determining effectiveness of treatment

    So the following scenario I have a treatment that I know to be effective, but I want to determine precisely how effective it in a (large) group of individuals I'm dividing them in to a test group and a control group so I can compare the effect of the treatment However, I want to keep the...
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    Determining minimum control group size for purposes of verifying lift

    I have the following scenario: - We want to send out an email blast to existing members to promote an upsell. - We are quite positive the email blast will increase the number of upsells, but we are interested in determining by how much. - So we want to keep a control group for...