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Mathematics, 27.05.2020 19:01 jasonlawrencejr6844

A study used nicotine gum to help people quit smoking. The study was placebo-controlled, randomized, and double-blind. Each participant was interviewed after 28 days, and success was defined as being abstinent from cigarettes for 28 days. The results showed that 197 out of 1647 people using the nicotine gum succeeded, and 85 out of 1620 using the placebo succeeded. Although the sample was not random, the assignment to groups was randomized. a. Find the proportion of people using nicotine gum that stopped smoking and the proportion of people using the placebo that stopped smoking, and compare them. Is this what the researchers had expected? b. Find the observed value of the test statistic, assuming that the conditions for a two-proportion z-test hold.

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