Arnold compares the means of three groups and calculates a value of -2.01 for the F-ratio. This implies ______.
A) the mean of the first group is the highest of the three groups
B) the mean of the third group is the highest of the three groups
C) the differences between the means are statistically significant
D) he has made an error in his calculations

Question

Quizplus · Accepted Answer

The F-ratio in ANOVA (Analysis of Variance) tests cannot be negative because it is based on variance, which is squared and therefore always positive. A negative F-ratio indicates a calculation error.

Arnold Compares the Means of Three Groups and Calculates a Value