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 confidence intervals?
A)20
B)4
C)3
D)19
E)16

Question

Quizplus · Accepted Answer

The degrees of freedom for the confidence intervals in this context is calculated as the total number of observations minus the number of groups, which is (20*4) - 4 = 80 - 4 = 76. However, since the question asks for the degrees of freedom for each group, it would be the number of observations per group minus 1, which is 20 - 1 = 19. But since the question is about the degrees of freedom for the confidence intervals of the means of the groups, it is the number of groups minus 1, which is 4 - 1 = 3. Therefore, the correct answer is 16, which is the degrees of freedom for the error term in an ANOVA, calculated as (number of groups - 1) * (number of observations per group - 1) = 3 * 19 = 57.

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