A research article reports the following: "The mean performance scores for the Normal Sleep, Reduced Sleep, and No Sleep groups were 18.0, 16.6, and 15.6, respectively, F(2,36)= 2.95, p

Question

A research article reports the following: "The mean performance scores for the Normal Sleep, Reduced Sleep, and No Sleep groups were 18.0, 16.6, and 15.6, respectively, F(2,36)= 2.95, p < .05." Based on this information, which conclusion is most accurate?
A)People who get no sleep perform significantly worse than people who sleep a reduced amount.
B)People who sleep a reduced amount perform significantly worse than people who sleep a normal amount.
C)The three groups do not all come from populations with the same mean, although it is not clear which population means are different.
D)This null hypothesis cannot be rejected.

Quizplus · Accepted Answer

The F statistic and p-value indicate that there is a significant difference among the group means, but without post-hoc comparisons, it's unclear which specific groups differ from each other.

A Research Article Reports the Following: "The Mean Performance Scores