For a simple random sample of 15 items from a population that is approximately normally distributed, x-bar = 82.0 and s = 20.5. At the 0.05 level of significance, test H0: μ ≥ 90.0 versus H1: μ < 90.0.
Answer to relevant QuestionsThe average age of passenger cars in use in the United States is 9.0 years. For a simple random sample of 34 vehicles observed in the employee parking area of a large manufacturing plant, the average age is 10.4 years, with ...A scrap metal dealer claims that the mean of his cash sales is “no more than $80,” but an Internal Revenue Service agent believes the dealer is untruthful. Observing a sample of 20 cash customers, the agent finds the ...The U.S. Census Bureau says the 52-question “long form” received by 1 in 6 households during the 2000 census takes a mean of 38 minutes to complete. Suppose a simple random sample of 35 persons is given the form, and ...For a simple random sample, n = 700 and p = 0.63. At the 0.025 level, test H0: π ≤ 0.60 versus H1: π > 0.60. Based on the sample results in Exercise 10.69, construct and interpret the 95% confidence interval for the population proportion. Is the hypothesized proportion (0.55) within the interval? Given the presence or absence of ...
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