Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments. Each participant takes the assigned medication and their systolic blood pressure (SBP) is recorded after 6 months on the assigned treatment. Is there a difference in mean SBP among the three treatment groups at the 5% significance level? The data are as follows. (Use alpha level = 0.05.)
Standard Treatment |
Placebo |
New Treatment |
124 |
134 |
114 |
111 |
143 |
117 |
133 |
148 |
121 |
125 |
142 |
124 |
128 |
150 |
122 |
115 |
160 |
128 |
What is dftotal?
A. 17
B. 15
C. 2
D. 18
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