Transcription of Statistics 211 Practice Exam 2 Answer key
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Statistics 211 Practice Exam 2 Answer key
Statistics 211 Practice Exam 2 Answer key1. The formula E(X) = np can be used to find the expected value of a. any numeric random variableb. only Poisson random variablesc. only normal random variablesd. only binomial random variables *e. none of the above2. For a specific sample size, the width of a 95% confidence interval on a. would be larger than the width of a 90% confidence interval on . *b. would be smaller than the width of a 90% confidence interval on .c. would be the same as the width of a 90% confidence interval on .d. cannot be compared to the width of a 90% confidence interval on .e. none of the above3. A random sample of 400 WVU students was selected, in which 150 students stated thatthey had used an illegal drug . A 95 % confidence interval on binomial parameter pgoes from to Which of the following statements provides the appropriateinterpretation of this 95 % confidence interval?
On a multiple-choice exam, there are 5 possible answers to each of 20 questions. Each question has only one correct answer. A student, “J”, has not studied and must A student, “J”, has not studied and must
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