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Let’s assume the average speed...

Let’s assume the average speed of a serve in women’s tennis is around 118 mph, with a standard deviation of 12 mph. We recruit 100 amateur tennis players to use our new training method this time, and after six months we calculate a group mean of 123 mph. Using a 95% confidence interval, test the hypothesis that our method makes a difference.a. Using a 95% confidence interval test the hypothesis that our method makes a difference.

b. Compute the effect size and describe its strength

b. Compute the effect size and describe its strength

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