Twenty-five blood samples were selected by taking every seventh blood sample from racks holding
187 blood samples from the morning draw at a medical center. The white blood count (WBC)
Was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard deviation
Of 3.9265. (a) Construct a 90 percent confidence interval for the true mean. (b) Why might
Normality be an issue here? (c) What sample size would be needed for an error of ± 1.5 with
98 percent confidence?

Twenty-five blood samples were selected by taking every seventh blood sample from racks holding
187 blood samples from the morning draw at a medical center. The white blood count (WBC)
Was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard deviation
Of 3.9265. (a) Construct a 90 percent confidence interval for the true mean. (b) Why might
Normality be an issue here? (c) What sample size would be needed for an error of ± 1.5 with
98 percent confidence?

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