Question

In a survey of 3611 adult Americans 18 years and older conducted in July 2010 by Smart Revenue, it was found that 542 have used their smartphone to make a purchase.
(a) Obtain a point estimate for the population proportion of adult Americans 18 years and older who have used their smartphone to make a purchase.
(b) Verify that the requirements for constructing a confidence interval about p are satisfied.
(c) Construct a 90% confidence interval for the population proportion of adult Americans who have used their smartphone to make a purchase.
(d) Interpret the interval.


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  • CreatedApril 28, 2015
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