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What is a minimum sample size needed to estimate a population mean to within 1 unit...

What is a minimum sample size needed to estimate a population mean to within 1 unit with 90% confidence? Assume that the population standard deviation is 6, and enter your result as a whole number.

Math   Statistics-And-Probability   
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Answer #1

We have given here,              
              
Population standard deviation =   6
Margin of error =E=1
Level of significance =   1-0.90=0.1
Z critical value is (by using Z table)=   1.645
Sample size formula is               


=97.40
Therefore, sample size approximately will be 98      

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