Thirty-three men with high serum cholesterol, all regular coffee drinkers, participated in a study to see whether
Question:
For the following t tests use non directional alternatives and let α = 0.05.
(a) The no-coffee group experienced a 35 mg/dl drop in mean cholesterol level. Use a t test to assess the statistical significance of this drop.
(b) The usual-coffee group experienced a 26 mg/dl rise in mean cholesterol level. Use a t test to assess the statistical significance of this rise.
(c) Use a t test to compare the no-coffee mean change (-35) to the usual-coffee mean change (+26).
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Related Book For
Statistics For The Life Sciences
ISBN: 9780321989581
5th Edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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