Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time. A recent sample of 1000 adults showed 410 indicating that their financial security was more than fair. Just a year before, a sample of 900 adults showed 315
indicating that their financial security was more than fair.
a. State the hypotheses that can be used to test for a significant difference between the
population proportions for the two years.
b. Conduct the hypothesis test and compute the p-value. At a .05 level of significance,
what is your conclusion?
c. What is the 95% confidence interval estimate of the difference between the two
population proportions? What is your conclusion?