Unformatted text preview: single population mean
B. Two independent samples t test
C. One way ANOVA F test
D. Paired difference t test
E. F test for equality of population variances 25. The Wilcoxon signed rank test is the nonparametric counterpart of the:
A. Large sample test about a single population mean
B. Two independent samples t test
C. One way ANOVA F test
D. Paired difference t test
E. F test for equality of population variances 26. The signed rank test is the nonparametric counterpart of the:
A. Small sample t test about a single population mean
B. Two independent samples t test
C. One way ANOVA F test
D. Paired difference t test
E. F test for equality of population variances 27. Parametric methods are ____________ more powerful than their nonparametric
counterparts.
A. Always
B. Sometimes
C. Never 11763 Chapter 01  An Introduction to Business Statistics 28. Five years ago, the average starting salary of a new college graduate with a major in
marketing was $34,000. A random sample of 10 graduates from this year's graduating class of
a local university yielded the following starting salaries in thousands of dollars: 38, 36, 25, 37,
35, 24, 38, 45, 39, and 36. The local university wants to determine if the starting salaries have
increased in the last five years. Assume that the population of starting salaries in marketing is
not normally distributed. Which one of the following tests is appropriate for this problem?
A. Wilcoxon signed rank test
B. Wilcoxon rank sum test
C. Sign test
D. KruskalWallis test
E. MannWhitney test 29. The EPA has stipulated that the PSI, "Pollution Standard Index" for clean air standards is
to be no more than 100 on the average. A random sample of 9 days for the city of Acorn
showed PSI readings of 144, 85, 90, 120, 150, 105, 93, 130 and 115. Assume the population
of PSI readings is highly nonnormal. EPA wants to determine if there is significant evidence
to conclude that Acorn's air is dirtier than the stipulated clean air standards. Which one of the
following tests is appropriate for this problem?
A. Wilcoxon signed rank test
B. Wilcoxon rank sum test
C. Sign test
D. KruskalWallis test
E. Spearman's rank correlation test 30. An ebusiness/ecommerce information technology consulting company wants to compare
the effectiveness of three programming languages that its programmers use. Currently each
programming language is used by approximately 1/3 of the programmers employed by the
company. The director of the programming division randomly selected 5 programmers from
the users of each of the three programming languages and assigned the same simple
programming task to each programmer. It is known that all three populations have highly
skewed distributions with extreme outliers. Which one of the following nonparametric tests is
appropriate for this problem?
A. Wilcoxon signed rank test
B. Wilcoxon rank sum test
C. Sign test
D. KruskalWallis test
E. Spearman's rank correlation test 11764 Chapter 01  An Introduction to Business Statistics 31. A copy machine service company provides maintenance and repair service for different
types and brands of copiers. The manager of the repair department wants to know if the repair
time for brand A is higher than the repair time for brand B. The manager randomly selected 8
repair records associated with brand A and 8 repair records associated with brand B. The
distribution of repair times for both brand A and brand B is highly skewed. Which one of the
following nonparametric tests is appropriate for this problem?
A. Wilcoxon signed rank test
B. Wilcoxon rank sum test
C. Sign test
D. KruskalWallis test
E. Spearman's rank correlation test 32. A cholesterol test was given to 10 heart patients with high cholesterol levels. The same 10
heart patients are then given a new cholesterolreducing drug for six months. Before the
patients begin taking the drug, they are told to maintain their current diets and eating habits so
that the effect of the drug can be more effectively determined. After taking the drug for six
months, the same patients are given a cholesterol test again. The pharmaceutical company
manufacturing the medicine wants to know if the drug is effective in reducing the cholesterol
levels of the patients. The cholesterol levels before and after taking the drug is recorded for
each patient. Distribution of cholesterol level is not normally distributed. Which one of the
following nonparametric tests is appropriate for this problem?
A. Wilcoxon signed rank test
B. Wilcoxon rank sum test
C. Sign test
D. KruskalWallis test
E. Spearman's rank correlation test 33. Two NFL scouts are in the process of recruiting 7 college senior football players
(receivers). After a careful review and evaluation, both scouts ranked the seven receivers in
terms of their professional career prospects. If we want to determine whether the two scouts
have similar opinions about the professional football career prospects of the seven players,
which one of the following nonparametric tests...
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