The incidence of eating disorders in the general

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Understandable Statistics: Concepts and Methods
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Chapter 3 / Exercise 7
Understandable Statistics: Concepts and Methods
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18. (5 points). The incidence of eating disorders in the general population is .20. Many factors are taken into account like your score on the Eating Disorders Inventory. Previous work suggests that out of those people diagnosed with Eating Disorders, .70 of them score above 40 on the EatingDisorders Inventory (EDI) while .20 of those were not diagnosed with eating disorders scored above 40 on the EDI. What is the probability of being diagnosed with an Eating Disorder given that you scored above 40 on the EDI? Does giving the EDI improve the diagnostic accuracy for eating disor-ders?
.2
Does giving the EDI improve the diagnostic accuracy for eating disorders?
19.Assume the binomial distribution is appropriate. If N= 6 and P= 0.50, the probability of getting exactly 5 Pevents = _________.
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Understandable Statistics: Concepts and Methods
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Chapter 3 / Exercise 7
Understandable Statistics: Concepts and Methods
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20.Assume the binomial distribution is appropriate. If N= 10 and P= 0.30, the probability of getting at least 8 Pevents is _________.
21.Suppose you gavea multiple-choice exam with 16 questions on it. Each question has 4 alternatives. What is the probability that a student who guesses at random on each of the 16 questions will score 4 or fewer correct answers? Assume that each alternative to each question is equally likely to be chosen.a.0.6302b.0.7982c.0.0383d.0.0000

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