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A high-tech company wants to estimate the mean number of years of college education its employees...

A high-tech company wants to estimate the mean number of years of college education its employees have completed. A good estimate of the standard deviation for the number of years of college is 1.32. How large a sample needs to be taken to estimate μ to within 0.8 of a year with 98% confidence? (Round you answer up to the nearest whole number.)
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Math   Statistics-And-Probability   
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Answer #1

We have given here,              
              
Population standard deviation =1.32
Margin of error =E=0.8
Level of significance =   1-0.98=   0.02
Z critical value is =2.33

Sample size formula is

  

=14.734

              

Therefore, sample size approximately will be 15

          

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