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Determine the minimum sample size required when you want to be 90% confident that the sample...

Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and sigma=16.7. Assume the population is normally distributed.

Math   Statistics-And-Probability   
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Answer #1

We have given here,              
              
Population standard deviation =   16.7
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               


=754.55              
Therefore, sample size approximately will be 755

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