A Gallup poll found that only 28% of American adults expect to inherit money or valuable possessions from a relative. The poll’s margin of error was ±3 percentage points at a 95% confidence level. This means that

a. the poll used a method that gets an answer within 3% of the truth about the population 95% of the time.

b. the percent of all adults who expect an inheritance must be between 25% and 31%.

c. if Gallup takes another poll on this issue, the results of the second poll will lie between 25% and 31%.

d. there’s a 95% chance that the percent of all adults who expect an inheritance is between 25% and 31%.

e. Gallup can be 95% confident that between 25% and 31% of the sample expect an inheritance.

Select the best answer.