FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
Question
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A famous medical experiment was conducted by the Nobel Laureate Linus Pauling who believed that vitamin C prevents colds. His subjects were 279 French skiers who were randomly assigned to receive vitamin C or a placebo. Of the 139 given vitamin C, 17 got a cold. Of the 140 given the placebo, 31 got a cold. Find and interpret a 95% confidence interval for the difference of two proportions.

1sample tinterval(mean difference)


1proportion zinterval


2sample tinterval (difference in means)


2proportion zinterval

Explanation:
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