The following data represent the results of a repeated-measures study comparing different viewing distances for a 42-inch, high-definition television.

Four viewing distances were evaluated: 9 feet, 12 feet, 15 feet, and 18 feet. Each participant was free to move back and forth among the four distances while watching a 30-minute video on the television. The only restriction was that each person had to spend at least two minutes watching from each of the four distances. At the end of the video, each participant rated all of the viewing distances on a scale from 1 (very bad, definitely need to move closer or farther away) to 7 (excellent, perfect viewing distance).

a. Use a repeated-measures ANOVA with a 5.05 to determine whether there are significant differences among the four viewing distances.

b. Compute h2 to measure the size of the treatment effect.

Viewing Distance Person 9 Feet 12 Feet 15 Feet 18 Feet Person Totals A 3 4 7 6 P 5 20 n 5 5 B 0 3 6 3 P 5 12 k 5 4 C 2 1 5 4 P 5 12 N 5 20 D 0 1 4 3 P 5 8 G 5 60 E 0 1 3 4 P 5 8 ΣX2 5 262 T 5 5 T 5 10 T 5 25 T 5 20 SS 5 8 SS 5 8 SS 5 10 SS 5 6