The national institutes of health (NIH) set up a study to determine whether large doses of vitamin C could shorten the length of takes to recover from a cold. 3000 volunteers are split into two groups. For two weeks, members of group it took 3000 mg of vitamin C daily. Good be received 3000 mg of a placebo. At the end of the two-week. The researchers inserted life viruses directly into the noses of all the volunteers. The volunteers in both Group A and Group B continue to take their daily pills. All volunteers got cold, and there were no Significant differences in the length of the time the colds lastedWhich was the experimental group?

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