a-20172017-survey-found-that-2828-of-us-adults-regularly-shop-for-groceries-onli

Question

A 20172017 survey found that 28%28\% of U.S. adults regularly shop for groceries online. Researchers now want to estimate the current percentage of adults who shop online for groceries. To obtain a 95%95\% confidence level and a margin of error of 22 percentage points, how many adults must be surveyed now? Does the use of the 20172017 survey result significantly affect the required sample size?

Accepted Answer

19371937 Yes. Using the 20172017 survey result reduces the required sample size.

Answer

26822682Yes. Using the 20172017 survey result reduces the required sample size.

Answer

35083508Yes. Using the 20172017 survey result increases the required sample size.

Answer

29452945No. Using the 20172017 survey result does not significantly change the required sample size.