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    Determining Sample Size of Two Groups

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    Mary is conducting a study and wants to determine sample size of two groups.

    One group has a mean of 3.5 with standard deviation of .8
    the other group has a mean of 2.1 with a standard deviation of .5

    How many N are needed in each group to have a 95% chance of detecting a significant difference using a two-sided alpha at .05?

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    Solution Summary

    The solution determines the sample size of two groups.