The Food and Drug Administration Wishes to Determine Whether the Claim

Multiple Choice

The Food and Drug Administration wishes to determine whether the claim that Vitamin C prevents colds has any truth. In a clinical drug trial, 30 subjects were randomly assigned to either the Vitamin C group (receiving a daily supplement of the minimum daily requirement) or the placebo group (who received no supplement but did get a placebo pill) . The number of self-reported colds is recorded after 3 years. $\begin{array}{cc}\text { Vitamin C } & \text { Placebo } \\\hline 3 & 8 \\8 & 8 \\6 & 7 \\7 & 10 \\4 & 11 \\9 & 4\\2 & 3 \\5 & 7 \\7 & 6 \\11 & 8 \\10 & 4 \\8 & 10 \\7 & 6 \\6 & 8 \\7 & 5\\\hline\end{array}$
-What can be concluded from the statistical analysis of this problem?

A) the null hypothesis cannot be rejected
B) Vitamin C doesn't seem to prevent colds any better than a placebo
C) the mean number of colds is not significantly different between the two groups
D) all of the above are true