An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 milligrams (mg) of vitamin C versus those who were not given a vitamin supplement. Suppose that 35 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows:

a. If your research objective is to show that the use of vitamin C reduces the mean time required to recover from a common cold and its complications, give the null and alternative hypotheses for the test. Is this a one- or a two-tailed test?
b. Conduct the statistical test of the null hypothesis in part a and state your conclusion. Test using α = .05.

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No Viti 4mg Supplement Vitamin C 35 35 Sample Size Sample Mean Sample Standard Deviation 5.8 1.2 6.9 2.9