A study is conducted to determine whether sunshine affects depression. Eight individuals are given a questionnaire measuring depression immediately following a run of 10 consecutive days when the sun shone for over 80% of the daylight hours. The same individuals have their depression measured immediately following 10 consecutive days without any sunshine. The following data are collected. The higher the score the greater the depression.
Individuals 1 2 3 4 5 6 7 8
Sunshine 10 12 14 11 12 10 14 15
No Sunshine 20 21 17 14 18 8 18 14
Using the Wilcoxon signed ranks test to evaluate the data, with a = 0.052 tail, Tcrit =
a. - 3
c. 33
b. 3
d. 4
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