Question
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.
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.
) Construct a 90 percent confidence interval for the true mean. (Round your answers to 2 decimal places.)
) Normality may be an issue here because:
- The sample size is very small
- The distribution is skewed
- The sample size is very big
- There are possible outliers
C) What sample size would be needed for an error of 1.5 with 98 percent confidence? (Round your answer to the nearest whole number.)
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