Statistics for Business and Economics (13th Edition)
13th Edition
ISBN: 9780134506593
Author: James T. McClave, P. George Benson, Terry Sincich
Publisher: PEARSON
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Textbook Question
Chapter 7.7, Problem 7.88ACB
Lobster trap placement. Refer to the Bulletin of Marine Science (April 2010) observational study of lobster trap placement by teams fishing for the red spiny lobster in Baja California Sur, Mexico, Exercise 7.54 (p. 393). Trap-spacing measurements (in meters) for a sample of seven teams of red spiny lobster fishermen are repeated in the table. (These measurements are for the BT cooperative in the accompanying data file.) The researchers want to know whether α2, the variation in the population of trap-spacing measurements, is larger than 10m2. They will conduct a test of hypothesis using α = .05.
93 | 99 | 105 | 94 | 82 | 70 | 86 |
- a. Specify the null and alternative hypotheses for this test.
- b. Find the variance of the sample data, s2.
- c. Note that s2 > 10. Consequently, a fisherman wants to reject the null hypothesis. What are the problems with using such a decision rule?
- d. Compute the value of the test statistic.
- e. Use statistical software to find the p-value of the test.
- f. Give the appropriate conclusion.
- g. What conditions must be satisfied for the test results to be valid?
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[4-5] CONSIDER that the data is UNCORRELATED use alpha .05. Provide the following:
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The owner of Showtime Movie Theaters, Inc., would like to predict weekly gross revenue as a function of advertising expenditures. Historical data for a sample of eight weeks follow.
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a. Use alpha= 0.01 to test the hypotheses
Ho : Beta Sub1= Beta Sub2 =0
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for the model y=Beta Sub 0+ Beta Sub1 Xsub1+Beta Sub2 Xsub2+E , where
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Chapter 7 Solutions
Statistics for Business and Economics (13th Edition)
Ch. 7.2 - Which hypothesis, the null or the alternative, is...Ch. 7.2 - Which element of a test of hypothesis is used to...Ch. 7.2 - What is the level of significance of a test of...Ch. 7.2 - What is the difference between Type I and Type II...Ch. 7.2 - List the four possible results of the combinations...Ch. 7.2 - We reject the null hypothesis when the test...Ch. 7.2 - If you test a hypothesis and reject the null...Ch. 7.2 - For each of the following rejection regions,...Ch. 7.2 - Use the applet Hypothesis Test for a Mean to...Ch. 7.2 - Americans favorite sport. The Harris Poll...
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Under what...Ch. 7.5 - For each of the following rejection regions,...Ch. 7.5 - A random sample of n observations is selected from...Ch. 7.5 - A sample of five measurements, randomly selected...Ch. 7.5 - Suppose you conduct a 1-test for the null...Ch. 7.5 - Performance-based logistics. Refer to the Journal...Ch. 7.5 - Accidents at construction sites. In a study...Ch. 7.5 - Lobster trap placement. Refer to the Bulletin of...Ch. 7.5 - Radon exposure in Egyptian tombs. Refer to the...Ch. 7.5 - Performance of stock screeners. Recall, from...Ch. 7.5 - Oxygen bubble velocity in a purification process....Ch. 7.5 - Shopping vehicle and judgment. Refer to the...Ch. 7.5 - Minimizing tractor skidding distance. Refer to the...Ch. 7.5 - Crude oil biodegradation. Refer to the Journal of...Ch. 7.5 - Increasing hardness of polyester composites....Ch. 7.5 - Arsenic in smelters. 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