Learn how to test for a difference between the means of 2 groups and estimate the size
of the effect.
Twenty-one African-American men participated in an experiment to test whether increasing
calcium intake reduces blood pressure. Ten of the men took a calcium supplement for 12 weeks
while the remaining 11 men received a placebo. Researchers measured the blood pressure of each
subject before and after the 12-week period. The experiment was double-blind.
In this tutorial you will perform the following
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