When 20 participants come to their appointment time, they report to the researcher how many hours of sleep they had the previous night. The researcher then tests their reaction times.
- state the null hypothesis and alternative hypothesis in words (not formulas).
- should the researcher conduct a one-tailed or two-tailed test.
- Identify the correlation coefficient (r) for this data set using SPSS.
Participant Sleep Time Reaction Time
1 7.5 0.82
2 7 0.84
3 6 0.76
4 7 0.9
5 8.5 0.66
6 7.75 0.86
7 6.75 0.72
8 6.25 0.86
9 7.75 0.86
10 7.25 0.74
11 6.5 0.77
12 8.5 0.93
13 6.25 0.9
14 7.25 0.88
15 5.5 0.84
16 8.25 0.7
17 7.25 0.7
18 5.5 0.82
19 6 0.81
20 6.25 0.8