Refer to the Pew Internet and American Life Project (April 2008) survey of the writing habits of U.S. teenagers, Exercise. Recall that in a random sample of 700 teenagers, 448 admitted to using at least one informal element in school writing assignments. Is there evidence to indicate that less than 65% of all U.S. teenagers have used at least one informal element in school writing assignments? Test the relevant hypotheses using α = .05.
Answer to relevant QuestionsAre student-athletes at Division I universities poorer students than non-athletes? The National Collegiate Athletic Association (NCAA) measures the academic outcomes of student-athletes with the Graduation Success Rate ...Refer to Exercise 8.99. a. If µ = 1,040 instead of 1,020, what is the probability that the hypothesis test will incorrectly fail to reject H0? That is, what is b? b. If µ = 1,040, what is the probability that the test ...A random sample of seven measurements gave x = 9.4 and σ2 = 1.84. a. What assumptions must you make concerning the population in order to test a hypothesis about σ2? b. Suppose the assumptions in part a are satisfied. ...A random sample of 20 observations selected from a normal population produced x = 72.6 and s2 = 19.4. a. Form a 90% confidence interval for m. b. Test H0:µ= 80 against Ha: µ< 80. Use α = .05. c. Test H0:µ= 80 against ...Refer to Exercise 8.153. a. In the context of the problem, define a Type II error. b. Calculate b for the test described in part a of Exercise 8.153, assuming that the true mean is µ = 3.1 ppm. c. What is the power of ...
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