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On November 13-15,2000, the Gallup Organization surveyed 1,028 adults and found that 257 of them had smoked at least one cigarette in the past week.
On November 13-15,2000, the Gallup Organization surveyed 1,028 adults and found that 257 of them had smoked at least one cigarette in the past week. In 1990, they also asked 1,028 adults the same question and determined that 278 adults had smoked at least one cigarette in the past week. Test the claim that the proportion of adults who had smoked at least one cigarette in the past week decreased from its 1990 level at the α= 0.05 level of significance.
A.) State the null and alternative hypotheses
B.) State which test you used and why you used it.
C.) State your conclusion mathematically and state the reason why.
D.) State your conclusion in terms of the problem.
E.) Construct a 95% confidence interval for the difference between the two population proportions. Is there a significant difference in the two proportions?
