Reference no: EM132144073

A study if the impact of stress on the amount of beta-endorphins released in the blood was reported. Researchers took beta-endorphin levels for 19 patients 12 hours before surgery and again 10 minutes before surgery. If you assume that time before surgery (12 hrs vs. 10 minutes) is a manipulation of stress, does the data indicate that stress affects beta-endorphin levels in the blood? Use a two tailed hypothesis alpha =.05. The data are below.

Insert the mean and SD for the 12 hour and 10 minute condition below

Subject 12 hours 10 minutes

1 10 6.5

2 6.5 14.0

3 8.0 13.5

4 12.0 18.0

5 5.0 14.5

6 11.5 9.0

7 5.0 18.0

8 3.5 42.0

9 7.5 7.5

10 5.8 6.0

11 4.7 25.0

12 8.0 12.0

13 7.0 52.0

14 17.0 20.0

15 8.8 16.0

16 17.0 15.0

17 15.0 11.5

18 4.4 2.5

19 2.0 2.0

(1)State the null hypothesis:

(1)State the nondirectional alternative hypothesis:

Insert the appropriate values below

∑D= ∑D2= SSdif=

SSdiff=

(2) t=

(1) critical t=