Introduction To Probability And Statistics
15th Edition
ISBN: 9781337554428
Author: Mendenhall, William.
Publisher: Cengage Learning,
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Textbook Question
Chapter 5, Problem 10RWYL
Psychosomatic Problems A psychiatrist believesthat 80% of all people who visit doctors have problemsof a psychosomatic nature. She decides to select 25patients at random to test her theory.
- Assuming that the psychiatrist’s theory is true, whatis the expected value of x. the number of the 25patients who have psychosomatic problems?
- What is the variance of x, assuming that the theoryis true? Find
- (Use tables and assume that thetheory is true.)
- Based on the
probability in part e, if only 14 of the25 sampled had psychosomatic problems. What conclusions would you make about the psychiatrist’s theory? Explain.
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