Rresearcher investigated the effect of the volume of the background noise on participants' accuracy rates while performing a boring task. He tested 3 groups of randomly selected students, and obtained the following means and sums of squares:
Low volume Moderate volume High volume
Mean 61.5 65.5 48.25
ni 4 5 7
Source Sum of squares df MS F
Between 652.16
Within 612.75
Total 1264.92
(a) Complete the ANOVA.
(b) At a=0.05, what is Fcrit? Report the results of the ANOVA.
(c) Perform the appropriate post-hoc tests.
(d) What do you conclude from this study?.