Question

Asked Sep 25, 2019

Suppose an advertising company wants to determine the current percentage of customers who read print magazines. How many customers should the company survey in order to be 98% confident that the estimated (sample) proportion is within 5percentage points of the true population proportion of customers who read print magazines?

z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
---|---|---|---|---|

1.282 | 1.645 | 1.960 | 2.326 | 2.576 |

Step 1

Given data

Error = 5% = 0.05

Confidence level = 0.98

Significance level = α=1-0.98=0.02

Step 2

Here percentage proportion is not given, so we assume p...

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