Final Exam Question 8 of 24 This test: 24 point(s) possible This question: 1 point(s) possible Submit test K 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 187 out of 1609 people using the nicotine gum succeeded, and 84 out of 1625 using the placebo succeeded. 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. a. Find the proportion of people in the sample using the nicotine gum that stopped smoking. (Round to four decimal places as needed.) Find the proportion of people in the sample using the placebo that stopped smoking. (Round to four decimal places as needed.) Is this what the researchers had expected? The proportion of people using the nicotine gum that stopped smoking was than that for those using the placebo. This shows that the nicotine gum helpful compared to the placebo, which what the researchers had expected. b. What is the observed value of the test statistic? (Find the test statistic for P1 - P2, where p, is the proportion over the sample of people using the nicotine gum and p2 is the proportion over the sample of people using the placebo.) z= (Round to two decimal places as needed.) Time Remaining: 01:29:40 Next MacBook Pro 1))