1. Two issues have dominated the discussion of how to choose between nonparametric and parametric tests. What are they?
2. Many studies show that noise affects cognitive functioning. The data that follow mirror the results of Hygge, Evans, and Bullinger (2002). One elementary school was near a noisy airport; the other was in a quiet area of the city. Fifth-grade students were given a difficult reading test at both schools under no-noise conditions. The errors of 17 students follow. Analyze the errors with a Mann-Whitney U test and write a conclusion about the effects of noise on reading.
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Near airport
|
32
|
25
|
22
|
20
|
18
|
15
|
15
|
13
|
|
|
Quiet area
|
23
|
19
|
16
|
14
|
12
|
11
|
10
|
8
|
7
|