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# A business student is interested in estimating the 90% confidence interval for the proportion of students...

 A business student is interested in estimating the 90% confidence interval for the proportion of students who bring laptops to campus. He wishes a precise estimate and is willing to draw a large sample that will keep the sample proportion within eight percentage points of the population proportion. What is the minimum sample size required by this student, given that no prior estimate of the population proportion is available?

We have given,

Preliminary estimate for proportion (Not Known) = 0.5
Margin of error =E=0.08
Level of significance =   1-0.90=0.1
Z critical value is (by using Z table) =1.645
Sample size formula is

=105.7

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