For a simple random sample of 40 items, x-bar = 25.9 and s = 4.2. At the 0.01 level of significance, test H0: μ = 24.0 versus H1: μ ≠ 24.0.
Answer to relevant QuestionsFor 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. The new director of a local YMCA has been told by his predecessors that the average member has belonged for 8.7 years. Examining a random sample of 15 membership files, he finds the mean length of membership to be 7.2 years, ...Using the sample results in Exercise 10.52, construct and interpret the 95% confidence interval for the population mean. Is the hypothesized population mean (93 seconds) within the interval? Given the presence or absence of ...For a simple random sample, n = 1000 and p = 0.47. At the 0.05 level, test H0: π ≥ 0.50 versus H1: π < 0.50. Following a major earthquake, the city engineer must determine whether the stadium is structurally sound for an upcoming athletic event. If the null hypothesis is “the stadium is structurally sound,” and the alternative ...
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