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Platelet counts in women (cont): A simple random sample of 30 women is selected. From this...

Platelet counts in women (cont): A simple random sample of 30 women is selected. From this sample, the sample standard deviation is calculated to be s = 65.2 . It is safe to assume the platelet counts in women are normally distributed. In building a 99% confidence interval for the population standard deviation platelet count, we next need to find the critical values. If we are interested in the standard deviation, we need to find Chi-Square values using table A-4. Calculate the left critical value, χ L 2 , using table A-4. Find the exact answer to three decimal places from the table.

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