A Medical Researcher Wishes to Try Three Different Techniques to Lower

Multiple Choice

A medical researcher wishes to try three different techniques to lower cholesterol levels of patients with highcholesterol levels. The subjects are randomly selected and assigned to one of three groups. Group 1 is givenmedication, Group 2 is given an exercise program, and Group 3 is assigned a diet program. At the end of sixweeks, each subjectʹs cholesterol level is recorded. Use α = 0.05. Which of the following is a correct statementabout the means? $$\begin{array} { c c c } \hline \text { Group 1 } & \text { Group 2 } & \text { Group 3 } \\\hline 13 & 8 & 6 \\12 & 5 & 12 \\9 & 2 & 4 \\15 & 3 & 4 \\11 & 4 & 9 \\8 & 0 & 8 \\\hline\end{array}$$

A) The mean of Group 1 is not equal to the mean of Group 2.
B) The mean of Group 1 is not equal to the mean of Group 3.
C) The mean of Group 2 is not equal to the mean of Group 3.
D) All of the means are not equal.