The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 95%confident that his estimate is within eight percentage points of the true population percentage? a) Assume that nothing is known about the percentage of adults who have heard of the brand.
The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 95%confident that his estimate is within eight percentage points of the true population percentage? a) Assume that nothing is known about the percentage of adults who have heard of the brand.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 7PPS
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The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 95%confident that his estimate is within eight percentage points of the true population percentage?
a) Assume that nothing is known about the percentage of adults who have heard of the brand.
n= ____
(Round up to the nearest integer.)
b) Assume that a recent survey suggests that about 83% of adults have heard of the brand.
n= _____
(Round up to the nearest integer.)
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