(a) Examine just the data relating to those who currently own or lease an Apple smartphone. Construct a confidence interval to describe the average intention to use their smartphone for purchasing products in the next month among current Apple users.
(b) Examine just the data relating to those who currently do not own or do not lease an Apple smartphone. Construct a confidence interval to describe the average intention to use their smartphone for purchasing products in the next month among such users.
(c) Do the confidence intervals overlap?
(d) What does your answer to (c) suggest about differences in the average intentions to use the smartphone for purchasing products in the next month between those who own or lease an Apple smartphone compared to those who do not?