Question

We want to know the percentage of students that own a bicycle to within 4% and...

We want to know the percentage of students that own a bicycle to within 4% and with 90% confidence. How many students would we need to SRS?

a) 401

b) 604            

c) 423            

d) 188

Math   Statistics-And-Probability   
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Answer #1

c) 423         

We have given,                  
Preliminary estimate for proportion (Not Known) = 0.5
Margin of error =E=0.04
Level of significance =1-0.90=0.1
Z critical value is (by using Z table) =1.645
Sample size formula is                   


=422.82       

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