A physician compared the cholesterol levels of a representative sample of Americans who ate an American diet versus a representative sample of those who followed a Mediterranean diet. Below are the means, standard deviations, and sample sizes for both samples. Though in some studies a Mediterranean diet has been shown to be beneficial, this was one of the first studies on an American population and the physician had made no advance predictions about the outcome. American diet (control): M = 230, s = 24, n = 36. Mediterranean (experimental): M = 190, s = 26, n = 36. Use α = .05.   6. Calculate the test statistic                     7. Estimate the magnitude of the effect size (Cohen’s d).       8. Calculate the 95% confidence interval for the differences between population means.

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  1. A physician compared the cholesterol levels of a representative sample of Americans who ate an American diet versus a representative sample of those who followed a Mediterranean diet. Below are the means, standard deviations, and sample sizes for both samples. Though in some studies a Mediterranean diet has been shown to be beneficial, this was one of the first studies on an American population and the physician had made no advance predictions about the outcome. American diet (control): M = 230, s = 24, n = 36. Mediterranean (experimental): M = 190, s = 26, n = 36. Use α = .05.

 



6. Calculate the test statistic

 

 

               

7. Estimate the magnitude of the effect size (Cohen’s d).

 

 

 

8. Calculate the 95% confidence interval for the differences between population means.

 

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