Question: Refer to the Pew Internet and American Life Project April
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 ...
Post your question