1)The data below are from a between-subjects experiment comparing three different treatment conditions regarding attention scores.(10 points)

Treatment 1Treatment 2Treatment 3

024

032G= 36

014X²= 114

333

024

014

-------------------------------------

T= 3T= 12T= 21

SS= 7.5SS= 4SS= 3.5

a. why should an ANOVA should be used instead of a series ofttests to evaluate the mean differences among the three treatment conditions?

b. Use an analysis of variance with = .05 to determine whether these data indicate any significant mean differences among the treatment conditions.

c. Compute ², the percentage of variance accounted for by the treatments.