A 2012 survey of 1,254 American cell phone owners indicates that 17% of those surveyed do their browsing on their phone rather than a computer or other device. You use these data to calculate a 95% confidence interval for the proportion of all American cell phone owners that do their browsing on their phone rather than a computer or other device.
-Suppose another survey was done on 532 American cell phone owners, and again, 17% of those surveyed do their browsing on their phone rather than a computer or other device. How would the 95% confidence interval from this survey compare to yours? This survey's interval would be:
A) Wider
B) Narrower
C) Same width
D) Cannot be determined with the information provided

Question

Quizplus · Accepted Answer

A smaller sample size (532 compared to 1,254) results in a wider confidence interval, assuming the same proportion and confidence level.

A 2012 Survey of 1,254 American Cell Phone Owners Indicates