Looking at four different diets,a researcher randomly assigned 20 equally overweight women into each of the four diets.What are the degrees of freedom for the individual confidence intervals?

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The Answer of Looking at four different diets,a researcher randomly assigned 20 equally overweight women into each of the four diets.What are the degrees of freedom for the individual confidence intervals?

Looking at Four Different Diets,a Researcher Randomly Assigned 20 Equally