Twenty-two volunteers at a cold research institute caught a cold after having been exposed to various cold viruses. A random sample of 10 of these volunteers was given tablets containing 1 gram of VItamin C four times a day. The control group, consiting of the remaining 12 volunteers, was given a placebo tablets that look the same as the Vitamin C tablets. The length of time the cold lasted was recorded.
| Group |
N |
X bar |
s |
| Vitamin C (group 1) |
10 |
6.450 |
0.762 |
| Placebo (group 2) |
12 |
7.125 |
0.882 |
Using the p value method, test if Vitamin C reduces the average time to recovery.