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Sample Size

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  • #24408

    Ropp
    Participant

    I have to select a statistically significant sample size from a population of 10,000 potential customers for treatment of a new process. The goal is to see whether that new process increases customers’ sales by X% compared to a control group that doesn’t go through the new process. Minitab’s Power and Sample Size function for a 1-Sample t has three variables (sample size, differences, power values), of which a user enters two to have the software calculate the third. No problemMy questions: (1) is this the right test (vs. 1 proportion), and (2)how do I determine what to enter for standard deviation?All replies appreciated.

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    #58633

    Summerfield
    Participant

    1. Depends upon your data
    2. You need to identify the standard deviation of the population.
    Or what you can do is collect the Population data (1 day) and some 2-3 samples on the very same day & with the help of Anova you could be able to verify the sampling method & also sample size.

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    #58653

    Anakin
    Participant

    I would agree with Ash however I would like to see the sample for the sd calculation taken over a more reasonable time frame if possible.  I do not believe that running an ANOVA with only a few data points would leave enough degrees of freedom to tell you anything meaningful.

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