In a study of balloon angioplasty, patients with coronary artery disease were randomly assigned to one of

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In a study of balloon angioplasty, patients with coronary artery disease were randomly assigned to one of four treatment groups: placebo, probucol (an experimental drug), multivitamins (a combination of beta carotene, vitamin E, and vitamin C), or probucol combined with multivitamins. Balloon angioplasty was performed on each of the patients. Later, "minimal luminal diameter" (a measurement of how well the angioplasty did in dilating the artery) was recorded for each of the patients. Summary statistics are given in the following table.40
In a study of balloon angioplasty, patients with coronary artery

(a) Complete the ANOVA table and bracket the P-value for the F test.

In a study of balloon angioplasty, patients with coronary artery

(b) What is the value of the F test statistic for testing that the effects of the four treatments are equal?
(c) How many degrees of freedom are there for the test from part (b)?
(d) The P-value for a one-way ANOVA F test is 0.0006. If α = 0.01, what is your conclusion regarding the null hypothesis?

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Statistics For The Life Sciences

ISBN: 9780321989581

5th Edition

Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner

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