A teacher believes that attendance in his classes has improved with a new lesson plan. Historically, his attendance rates have been 19.5 students per class of 30, with a standard deviation of 5.2. The teacher estimates that his new lesson plan will result in attendance of about 23 students per class.

Q1. What is the power of the test for a sample of 15 classes with the new lesson plan?

Q2. What is the effect size?

Q3. What is the statistical effect?

Q4. What sample size would he require for power = .95?

Q5. What sample would he require for power = .80?

Q6. What would the power of the same test be if the standard deviation was 4.5?

Possible answers for Q1: A) .50 B) 1 C) .84 D) .74

Possible answers for Q2: A) .67 B) .77 C) 8 D) 6

Possible answers for Q3: A) 2.61 B) 2.71 C) 2.81 D) 2.91

Possible answers for Q4: A) 29 B) 30 C) 31 D) 32

Possible answers for Q5: A) 17 B) 18 C) 19 D) 20

Possible answers for Q6: A) .93 B) .87 C) .91