What size samples are needed for a statistical power of 70, Basic Statistics

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What size samples are needed for a statistical power of 70

Use the sample size calculator online at "dssresearch" to work out these problems.

What size samples are needed for a statistical power of 70 percent in detecting a difference of 5 percent between the estimated percentages of recent CD buyers in two independent samples?

Assume an expected percentage in the range of 50 percent and an alpha error of 5 percent.

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Basic Statistics: What size samples are needed for a statistical power of 70

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