Question

1. A community psychologist selects a sample of 16 local police officers to test whether their physical endurance is better than the median score of 72. She measures their physical endurance on a 100-point physical endurance rating scale.

Performance Scores
56	83	91	57
86	84	70	82
80	95	73	78
51	90	77	75

Based on the data given above, compute the one-sample sign test at a 0.05 level of significance.
x =

2. A professor has a teaching assistant record the amount of time (in minutes) that a sample of 16 students engaged in an active discussion. The assistant observed 8 students in a class who used a slide show presentation and 8 students in a class who did not use a slide show presentation.

With Microsoft PowerPoint	Without Microsoft PowerPoint
21	5
23	7
9	6
14	10
15	4
8	13
11	19
18	12

Use the normal approximation for the Mann-Whitney U test to analyze the data above. (Round your answer to two decimal places.)
z =

Answer 1