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Smartphone Purchases In a survey of 3611 adult Americans 18 years and older conducted in
Chapter 9, Problem 25(choose chapter or problem)
Smartphone Purchases In a survey of 3611 adult Americans 18 years and older conducted in July 2010 by SmartRevenue, 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.
Questions & Answers
QUESTION:
Smartphone Purchases In a survey of 3611 adult Americans 18 years and older conducted in July 2010 by SmartRevenue, 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.
ANSWER:Step 1 of 5
Given:
The number of adult Americans 18 years and older conducted in July 2010 by SmartRevenue is 
The number of adult Americans who have used their smartphone to make a purchaseis 542.