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.

1. state the null hypothesis and alternative hypothesis in words (not formulas).
2. should the researcher conduct a one-tailed or two-tailed test.
3. 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