Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)
13th Edition
ISBN: 9780133873641
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 55PS
Suppose that, when setting up the experiment in Problem 11.54, the operations manager is able to study the effect of side-to-side aspect in addition to air-jet pressure. Thus, instead of the one-factor completely randomized design in Problem 11.54, a two-factor factorial design was used, with the first factor, side-to-side aspect, having two levels (nozzle and opposite) and the second factor, air-jet pressure, having three levels (30 psi, 40 psi, and 50 psi). A sample of 18 yarns is randomly assigned, 3 to each of the 6 side-to-side aspect and pressure level combinations. The breaking-strength scores, stored in Yarn, are as follows:
At the 0.05 level of significance,
a. is there an interaction between side-to-side aspect and air-jet pressure?
b. is there an effect due to side-to-side aspect?
c. is there an effect due to air-jet pressure?
d. Plot the mean yarn breaking strength for each level of side-to-side aspect for each level of air-jet pressure.
e. If appropriate, use the Tukey procedure to study differences among the air-jet pressures.
f. On the basis of the results of (a) through (e), what conclusions can you reach concerning yam breaking strength? Discuss.
g. Compare your results in (a) through (t) with those from the completely randomized design in Problem 11.38. Discuss fully.
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SCENARIO 1: A study was undertaken to compare clinical superiority between a new investigational
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1- Parasitic worm. Lymphatic filariasis is a disease caused by a parasitic worm. Complications of the disease can lead to extreme swelling and other complications. Here we consider results from a randomized experiment that compared three different drug treatment options to clear people of the this parasite, which people are working to eliminate entirely. The results for the second year of the study are given below:38
Three drugsTwo drugsTwo drugs annually
Clear at Year 2 523142
Not Clear at Year 2 22414
(a) Set up hypotheses for evaluating whether there is any difference in the performance of the treatments, and also check conditions.
(b) Statistical software was used to run a chi-square test, which output:X2 = 23.7 df = 2 p-value = 7.2e-6
Use these results to evaluate the hypotheses from part (a), and provide a conclusion in the context of the problem.
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Oral contraceptive use, Part II. Suppose that the study were repeated in a…
Question #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96
Chapter 11 Solutions
Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)
Ch. 11 - An experiment has a single factor with five groups...Ch. 11 - You are working with the same experiment as in...Ch. 11 - You are working with the same experiment as in...Ch. 11 - Consider an experiment with three groups, with...Ch. 11 - Prob. 5PSCh. 11 - You are working the same experiment as in Problem...Ch. 11 - Prob. 7PSCh. 11 - The more costly and time-consuming it is to export...Ch. 11 - A hospital conducted a study of the waiting time...Ch. 11 - A manufacturer of pens has hired an advertising...
Ch. 11 - QSR has been reporting on the largest quick-serve...Ch. 11 - Prob. 12PSCh. 11 - A pet food company has a business objective of...Ch. 11 - A sporting goods manufacturing company wanted to...Ch. 11 - Prob. 15PSCh. 11 - Prob. 16PSCh. 11 - Prob. 17PSCh. 11 - Prob. 18PSCh. 11 - Prob. 19PSCh. 11 - Prob. 20PSCh. 11 - Prob. 21PSCh. 11 - Prob. 22PSCh. 11 - Prob. 23PSCh. 11 - How do the rating for TV, phone, and Internet...Ch. 11 - Prob. 25PSCh. 11 - How different are the rates of return of money...Ch. 11 - Prob. 27PSCh. 11 - The data in Concrsts2 represent the compressive...Ch. 11 - Prob. 29PSCh. 11 - Prob. 30PSCh. 11 - Prob. 31PSCh. 11 - Prob. 32PSCh. 11 - Prob. 33PSCh. 11 - Prob. 34PSCh. 11 - Prob. 35PSCh. 11 - Prob. 36PSCh. 11 - Prob. 37PSCh. 11 - Prob. 38PSCh. 11 - A metallurgy company wanted to investigate the...Ch. 11 - An experiment was conducted to try to resolve a...Ch. 11 - Prob. 41PSCh. 11 - Prob. 42PSCh. 11 - Prob. 43PSCh. 11 - Prob. 44PSCh. 11 - Prob. 45PSCh. 11 - When and how should you use multiple comparison...Ch. 11 - What is the difference between the randomized...Ch. 11 - Prob. 48PSCh. 11 - Prob. 49PSCh. 11 - Prob. 50PSCh. 11 - Prob. 51PSCh. 11 - Prob. 52PSCh. 11 - Medical wires are used in the manufacture of...Ch. 11 - Prob. 54PSCh. 11 - Suppose that, when setting up the experiment in...Ch. 11 - Prob. 56PSCh. 11 - Prob. 57PSCh. 11 - Prob. 58PSCh. 11 - Prob. 59PSCh. 11 - Prob. 60PSCh. 11 - Prob. 61PS
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