The maker of a cell phone screen protector would like to estimate the proportion of customers who file a warranty claim. To do so, they select a random sample of 200 customers and determine that the 96% confidence interval for the true proportion of customers who file a warranty claim to be 0.15 to 0.28. Which of the following can be accounted for by the margin of error of this interval?

The margin of error reflects the uncertainty that comes from using a random sample rather than measuring every customer. This sampling variation is accounted for in the confidence interval. Response bias, nonresponse bias, and undercoverage bias are problems with how data are collected or who is included, and the margin of error does not correct for them.

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