EQuestion Help 27.1.37-T increase brand recognition. He wants to first determine

Question

EQuestion Help 27.1.37-T increase brand recognition. He wants to first determine the percentage of adults who have hoard of the brand. How many adults must he survey in order to be 90% The brand manager for a brand of toothpasto must plan a campaign designed to confident that his estimate is within seven percentage points of the true population percentage? Complete perts (a) through (c) balow n) Assume that nothing is known about tho percentage of edults who have heard of the brand Round up to the nearest intoger.) b) Assume that a recone survey sugges bs that about 79% of adults have heard of the brand Round up to the nearest intoger) Enter your answer in the answer box and then click Check Answer Clear All

Explanation / Answer

a)

When proportion is not specified, then p = 0.50

Sample size n = Z2 * p( 1 -p) / E2

= 1.6452 * 0.50 * 0.50 / 0.072

= 138

b)

Given, p = 0.79

Sample size n = Z2 * p( 1 -p) / E2

= 1.6452 * 0.79 * 0.21 / 0.072

= 91.6

n = 92 (Rounded up to nearest integer)

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