In the article Reduction in Red Blood Cells Transfusions Among Preterm Infants: Results of a Randomized TrialWith
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a. Do the data provide sufficient evidence to conclude that the variation in hemoglobin level is less without the inline blood gas and chemistry monitor? Perform a two-standard-deviations F-test at the 5% significance level.
b. Use the two-standard-deviations F-interval procedure to determine a 90% confidence interval for the ratio of the population standard deviations of hemoglobin levels with and without the inline blood gas and chemistry monitor.
c. Obtain a normal probability plot for each sample.
d. In light of your plots in part (c), does conducting the inferences you did in parts (a) and (b) seem reasonable? Explain your answer.
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