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

Question

A $2017$ survey found that $28 percent sign$ 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 $95 percent sign$ confidence level and a margin of error of $2$ percentage points, how many adults must be surveyed now? Does the use of the $2017$ survey result significantly affect the required sample size?

Accepted Answer

$1937$

Yes. Using the $2017$ survey result reduces the required sample size.

Answer

$1937$

Yes. Using the $28 percent sign$ survey result reduces the required sample size.

Answer

$1937$

Yes. Using the $28 percent sign$ survey result increases the required sample size.

Answer

$1937$

No. Using the $28 percent sign$ survey result does not significantly change the required sample size.