For any of the above experiments where there is a significant difference between the experimental group and the control group a) find the effect size using pooled standard deviation method; b) is the effect size meaningful? Why?

Experiment 1

Experimental Group

N = 40 M = 12 S² = 2.4

Control Group

N = 40 M = 11.1 S² = 2.8

Experiment 2

Experimental Group

N = 25 M = 12 S² = 2.4

Control Group

N = 42 M = 11.1 S² = 2.8

Experiment 3

Experimental Group

N = 40 M = 12 S² = 2.2

Control Group

N = 40 M = 11.1 S² = 3.0

Experiment 4

Experimental Group

N = 15 M = 604 S² = 60

Control Group

N = 15 M = 607 S² = 50

Experiment 5

Experimental Group

N = 45 M = 604 S² = 60

Control Group

N = 45 M = 607 S² = 50

Experiment 6

Experimental Group

N = 15 M = 604 S² = 20

Control Group

N = 45 M = 607 S² = 16