National Accounting Examination If the variance of a

Chapter 7, Problem 25E

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QUESTION:

Problem 25E

National Accounting Examination If the variance of a national accounting examination is 900, how large a sample is needed to estimate the true mean score within 5 points with 99% confidence?

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QUESTION:

Problem 25E

National Accounting Examination If the variance of a national accounting examination is 900, how large a sample is needed to estimate the true mean score within 5 points with 99% confidence?

ANSWER:

Solution:

Step 1 of 2:

          From the given problem, we have

        The variance = 900

        The standard deviation is

         

             = 30

Given E = 5

    Here we have to find the sample size.


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