Download the data file, Tylenol , from Blackboard, which contains data from a st

Question

Download the data file, Tylenol, from Blackboard, which contains data from a study of 26 adults suffering from severe emotional stress. The study evaluated the possible beneficial side-effect of the drug, acetaminophen, or Tylenol, in relieving anxiety among adults. Each adult was evaluated using Tylenol and a placebo treatment. The outcome measured was the adult’s anxiety score eight hours following each treatment (a higher numerical score is associated with higher levels of anxiety). Analyze the data as instructed below to assess if there is a difference in the post-treatment anxiety levels for the two treatment types.

Asses if there are any outliers. If there are outliers, perform a confience interval and two sample t test at alpha .01

Adult   Placebo   Tylenol
1   310   70
2   385   950
3   400   100
4   310   110
5   410   900
6   370   300
7   410   30
8   320   880
9   400   98
10   250   210
11   380   350
12   340   50
13   250   890
14   300   20
15   158   320
18   270   320
19   300   110
20   360   300
21   165   1020
22   230   120
23   100   130
24   120   360
25   65   250
26   390   99
27   530   40
28   280   920

Explanation / Answer

                            SE
          N Mean StDev Mean
Tylenol 26   344    342    67
Placebo 26   300    111    22

Difference = (Tylenol) - (Placebo)
Estimate for difference: 44.0
95% CI for difference: (-100.0, 188.0)
T-Test of difference = 0 (vs ): T-Value = 0.62 P-Value = 0.537 DF = 30

since p-value = 0.537 > 0.05

we fail to reject the null

there is no significant difference in the post-treatment anxiety levels for the two treatment types

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