Question

22 volunteers at a cold research institute caught a cold after having been exposed to various cold viruses. A random selection of 10 volunteers were given tablets containing 1 gram of vitamin C. These tablets were taken 4 times a day. The control group, consisting of the other 12 volunteers, was given placebo tablets that looked and tasted exactly like the vitamin C ones. The length of time the cold lasted was recorded. Treated with vitamin C placebo 5.5 6.5 6.0 6.0 7.0 8.5 6.0 7.0 7.5 6.5 6.0 8.0 7.5 7.5 5.5 6.5 7.0 7.5 6.5 6.0 8.5 7.0 Do the data prove that taking 4 grams of vitamin C daily reduces the time that a cold lasts at a 5% significance level? (assume equal variances) (30 points)

          22 volunteers at a cold research institute caught a cold after having been exposed to various cold viruses. A random selection of 10 volunteers were given tablets containing 1 gram of vitamin C. These tablets were taken 4 times a day. The control group, consisting of the other 12 volunteers, was given placebo tablets that looked and tasted exactly like the vitamin C ones. The length of time the cold lasted was recorded.

Treated with vitamin C placebo
5.5 6.5
6.0 6.0
7.0 8.5
6.0 7.0
7.5 6.5
6.0 8.0
7.5 7.5
5.5 6.5
7.0 7.5
6.5 6.0
8.5
7.0

Do the data prove that taking 4 grams of vitamin C daily reduces the time that a cold lasts at a 5% significance level? (assume equal variances) (30 points)

Added by Jonathan S.

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