A survey asked American adults cell phone owners if they browse the internet almost exclusively on their phone rather than a computer or other device. Of 1150 respondents ages 35 and above, 12% answered yes. Of 1025 respondents ages
22 to 34, 18% answered yes.
(a) Calculate a 98% confidence interval for the difference in proportion who access the internet almost exclusively on their
cell phones for the two groups of Amerian adults. State all necessary conditions.
(b) Provide an interpretation of the interval in context. Is there evidence in support of a difference? Explain.