Dr.Fillipe is investigating the effects of vitamin B consumption on stress levels.He randomly gives half of his participants a daily dose of vitamin B for one month while the other half takes a sugar pill.Each day,the participants provide a saliva sample to measure stress hormones.If Dr.FIllipe wanted to determine whether the vitamin B group had significantly lower levels of stress hormones compared to the sugar pill group,which of the following pieces of information would he NOT need to know?
A) the number of participants in each group
B) the mean levels of stress hormones of each group
C) the standard deviation for stress hormone levels of each group
D) the correlation coefficient of each group

Question

Quizplus · Accepted Answer

The correlation coefficient between the two groups is not relevant to the comparison of stress hormone levels between the vitamin B and sugar pill groups. It is important to know the number of participants in each group, as well as the mean and standard deviation of stress hormone levels for each group, in order to determine whether the difference in stress hormone levels between the two groups is statistically significant.

DrFillipe Is Investigating the Effects of Vitamin B Consumption on Stress