Question
Two different treatments for headaches (relaxation therapy and cognitive-behavioral therapy) were compared. A random sample of 24 headache sufferers was treated using relaxation therapy. They
Two different treatments for headaches (relaxation therapy and cognitive-behavioral therapy) were compared.
A random sample of 24 headache sufferers was treated using relaxation therapy. They had a mean of 3.82
headache-free days with a standard deviation of 1.75 days. Another random sample of 24 headache sufferers
were treated using cognitive-behavioral therapy resulting in a mean of 5.71 headache-free days with a standard
deviation of 1.43 days. What is a 90% confidence interval for the difference in mean headache-free days for
the cognitive-behavioral therapy group and the mean headache-free days for the relaxation therapy group?
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Discrete Mathematics Mathematical Reasoning And Proof With Puzzles, Patterns, And Games
Authors: Douglas E Ensley, J Winston Crawley
1st Edition
1118226534, 9781118226537
