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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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The solution determines the sample size of two groups.

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