To devise effective marketing strategies it is helpful to know the characteristics of your customers. A study compared demographic characteristics of people who use the Internet for travel arrangements and of people who do not use it. Of 1182 Internet users, 617 had completed college. Among the 827 non-users, 376 had completed college. use 4 decimal places for proportion or probability and 2 decimal places for z-scores.
a) Give a 95% confidence interval for the difference in the proportions. Calculate for [larger] - [smaller].
What is the lower confidence limit for the 95% CI?
b) What is the upper confidence limit for the 95% CI?
c) We want to know if users and non-users differ significantly in the proportion of college graduates.
What is the value for the test statistic?
d) What is the p-value for the test?