Dougkim1 Posts: 2, Reputation: 1 New Member #1 Apr 16, 2010, 11:17 PM
Twenty-five blood samples were selected by taking every seventh blood sample from rac
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?
 Dougkim1 Posts: 2, Reputation: 1 New Member #2 Apr 16, 2010, 11:20 PM

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?
 Curlyben Posts: 18,479, Reputation: 1857 Admin & Wine Expert #3 Apr 16, 2010, 11:22 PM
Thank you for taking the time to copy your homework to AMHD.

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