For each of the following six experiments decide if the difference between the two groups (experimental and control) is statistically significant using t test for independent means, and p < 0.05 level (two tailed test).

You must show all of your work. Please refer to the chapter slides and the examples. If you do not show your work, you will not receive credit for the problem(s).

Note: For ALL of the problems below you must show all of your work (Calculations), and you MUST use the formulas that have been included in the textbook and slides. You cannot use any other formula for showing your calcuations. If any other formula is use, even if you arrived at a correct answer, you will not receive any credit. To see an example of how to do these problems, please refer to the Chapter 11 Slides and Notes in the Modules. If youdo not include yourcalculations, the score for that problem will be zero.

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