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unit 3 quiz 3

Quiz Submissions - Unit 3 Quiz Question 1 2 / 2 points Consider the following null and alternative hypotheses. Ho: μ ≤ 67 Ha: μ > 67 These hypotheses: Correct Response 1) indicate a one-tailed test with a rejection area in the right tail 2) indicate a one-tailed test with a rejection area in the left tail 3) indicate a two-tailed test 4) are established incorrectly 5) are not mutually exclusive Question 2 2 / 2 points Consider the following null and alternative hypotheses. Ho: μ = 67 Ha: μ ≠ 67 These hypotheses: 1) indicate a one-tailed test with a rejection area in the right tail 2) indicate a one-tailed test with a rejection area in the left tail Correct Response 3) indicate a two-tailed test 4) are established incorrectly 5) are not mutually exclusive Question 3 2 / 2 points The normal distribution is used to test about a population mean for large samples if the population standard deviation is known. "Large" is usually defined as: 1) at least 10 2) at least 5% of the population size Correct Response 3) at least 30 4) at least 12 5) at least 100 Question 4 2 / 2 points Consider the following null and alternative hypotheses. Ho: p < 0.16 Ha: p > 0.16 These hypotheses: Correct Response 1) indicate a one-tailed test with a rejection area in the right tail 2) indicate a one-tailed test with a rejection area in the left tail 3) indicate a two-tailed test 4) are established incorrectly 5) are not mutually exclusive Question 5 2 / 2 points A company produces an item that is supposed to have a 6-inch hole punched in the center. A quality control inspector is concerned that the machine that punches the hole is "out-of-control" (hole is too large or too small). In an effort to test this, the inspector is going to gather a sample punched by the machine and measure the diameter of the hole. The alternative hypothesis used to statistically test to determine if the machine is out-of-control is: 1) the mean diameter is > 6 inches 2) the mean diameter is < 6 inches 3) the mean diameter is = 6 inches Correct Response 4) the mean diameter is ≠ 6 inches 5) the mean diameter is ≥ 6 inches Question 6 2 / 2 points A researcher is testing a hypothesis of a single mean. The critical z value for a = .05 and a two‑tailed test is 1.96. The observed z value from sample data is ‑2.05. The decision made by the researcher based on this information is to _____ the null hypothesis. Correct Response 1) reject 2) not reject 3) redefine 4) change the alternate hypothesis into 5) restate the null hypothesis Question 7 2 / 2 points Jennifer Cantu, VP of Customer Services at Tri-State Auto Insurance, Inc., monitors the claims processing time of the claims division. Her standard includes "a mean processing time of less than 5 days." Each week, her staff checks for compliance by analyzing a random sample of 60 claims. Jennifer's null hypothesis is: 1) μ > 5 2) σ > 5 3) n = 60 Correct Response 4) μ < 5 5) μ = 5 Question 8 2 / 2 points Restaurateur Denny Valentine is evaluating two sites, Raymondville and Rosenberg, for his next restaurant. He wants to prove that Raymondville residents (population 1) dine out more often than Rosenberg residents (population 2). Denny plans to test this hypothesis using a random sample of 81 families from each suburb. His null hypothesis is: 1) σ12 < σ22 2)

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Document information
Institution
Course code
GB513
Pages
6
Written in
2017/2018
Type
Exam
Book Title
Business Statistics
Author(s)
Ken Black
Year
2011
Edition
Unknown
Whole Book
No
Summarized
Chapter 9 and 10
Contains
questions_and_answers
Subjects
Uploaded
June 24, 2018
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aimeeval
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