Inference from sample statistics and margin of error · 第 1 题

Inference from sample statistics and margin of error · 原库模块 1 · Q1 原库参考解析

In a study of cell phone use, 799 randomly selected US teens were asked how often they talked on a cell phone and about their texting behavior. The data are summarized in the table above. Based on the data from the study, an estimate of the percent of US teens who are heavy texters is 30% and the associated margin of error is 3%. Which of the following is a correct statement based on the given margin of error?