## A marketing firm is asked to estimate the percent of existing customers who would purchase a “digital upgrade” to their basic cable TV servi

Question

A marketing firm is asked to estimate the percent of existing customers who would purchase a “digital upgrade” to their basic cable TV service. The firm wants 99 percent confidence and an error of ± 5 percent. What is the required sample size (to the next higher integer)?A. 664B. 625C. 801D. 957

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2021-10-13T23:46:19+00:00
2021-10-13T23:46:19+00:00 1 Answer
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## Answers ( )

Answer:A. 664Step-by-step explanation:Given :A marketing firm is asked to estimate the percent of existing customers who would purchase a “digital upgrade” to their basic cable TV service.But there is

no information regarding the population proportion is mentioned.Formula to find the samples size , if the prior estimate to the population proportion is unknown :

, where E = Margin of error.

z* = Two -tailed critical z-value

We know that critical value for 99% confidence interval = [By z-table]

Margin of error = 0.05

Then, the minimum sample size would become :

Simplify,

Thus, the required sample size= 664

Hence, the correct answer is

A. 664.