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What is the effect size

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Reference no: EM132907281

Let's test the hypothesis that age differs with class rank. Using the students in our class as a sample: The age for the 74 Junior students has a mean of 21.24 and a standard deviation of 1.629.

The age for 65 Senior students has a mean of 22.9 and a standard deviation of 3.4843.

Use alpha = 0.01.

1.What is the effect size (Cohen's d)?

2.How would you describe the size of this effect?

3. Use the power curves, the Excel calculator, or R to calculate the observed power of this test

4.Suppose you conduct a t-test and get a p-value exactly equal to α = .05, What is your observed value of t compared to the critical value of t?

5.What is the observed power of this test?

Reference no: EM132907281

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