Marketing companies are interested in knowing the population percent of women who make the majority of household purchasing decisions. when designing a study to determine this population proportion, what is the minimum number you would need to survey to be 90% confident that the population proportion is estimated to within 0.05? (round your answer up to the nearest whole number.)

271

Step-by-step explanation:

As per given description in the question, we have

Critical value for 90% confidence interval =

[using z-value calculator ]

Margin of error : E= 0.05

Since prior estimate of population proportion is unknown so we take p= 0.5

Formula we use to find the sample size :

 [we assume p= 0.50]

i.e.

Simplify :

Therefore , the minimum sample size required = 271

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