Texting behavior Talks on cell phone daily Does not talk on cell phone daily Total

Light 110 146 256

Medium 139 164 303

Heavy 166 74 240

Total 415 384 799

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 percentage 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?

Question

Texting behavior	Talks on cell phone daily	Does not talk on cell phone daily	Total
Light	110	146	256
Medium	139	164	303
Heavy	166	74	240
Total	415	384	799

Accepted Answer

It is doubtful that the percent of all US teens who are heavy texters is 35%.

Answer

Approximately 3% of the teens in the study who are classified as heavy texters are not really heavy texters.

Answer

It is not possible that the percent of all US teens who are heavy texters is less than 27%.

Answer

The percent of all US teens who are heavy texters is 33%.