I need an explanation for this Statistics question to help me study.
Problem 32. Race and smoking 2013 Data collected in 2013 by the behavioral Risk Factor Surveillance System revealed that in the state of New Jersey, 14.7% of whites and 18.8% of blacks were cigarette smokers. Suppose these proportions were based on samples 11,112 white and 1916 blacks.
A) Create a 90% confidence interval for the difference in the percentage of smokers between black and white adults in New Jersey.
B) Does the survey indicate a race-based difference in smoking among American adults? Explain, using your confidence interval to test an appropriate hypothesis.
C) What alpha level did you test use?
Answer link below
Problem 40. Politics and sex One month before the election, a poll of 630 randomly selected voters showed 54% planning to vote for a certain candidate. A week later, it became known that he had had as extramarital affair, and a new poll showed only 51% of 1010 voters supporting him. Do these results indicate a decrease in voter support for his candidacy?
A) Test an appropriate hypothesis and state your conclusion.
B) If you concluded there was a difference, estimate that difference with a confidence interval and interpret your interval irt context.
for this one I found different answer from chegg but it is not same like slader there for double check if it is the right answer