31. TABLE 11-5 A physician and president of a Tampa Health MaintenanceOrganizati

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31. TABLE 11-5

A physician and president of a Tampa Health MaintenanceOrganization (HMO) are attempting to show the benefits of managedhealth care to an insurance company. The physician believes thatcertain types of doctors are more cost-effective than others. Onetheory is that Primary Specialty is an important factor inmeasuring the cost-effectiveness of physicians. To investigatethis, the president obtained independent random samples of 20 HMOphysicians from each of 4 primary specialties - General Practice(GP), Internal Medicine (IM), Pediatrics (PED), and FamilyPhysicians (FP) - and recorded the total charges per member permonth for each. A second factor which the president believesinfluences total charges per member per month is whether the doctoris a foreign or USA medical school graduate. The presidenttheorizes that foreign graduates will have higher mean charges thanUSA graduates. To investigate this, the president also collecteddata on 20 foreign medical school graduates in each of the 4primary specialty types described above. So information on chargesfor 40 doctors (20 foreign and 20 USA medical school graduates) wasobtained for each of the 4 specialties. The results for the ANOVAare summarized in the following table.



Referring to Table 11-5, what degrees of freedom should be used todetermine the critical value of the F ratio against whichto test for differences in the mean charges for doctors among thefour primary specialty areas?

A)numerator df = 1, denominator df = 159
B)numerator df = 3, denominator df = 152
C)numerator df = 3, denominator df = 159
D)numerator df = 1, denominator df = 152

32. Which of the following components in an ANOVA table are notadditive?

A)degrees of freedom
B)sum of squares
C)mean squares
D)It is not possible to tell.

33.TABLE 12-3

A computer used by a 24-hour banking service is supposed torandomly assign each transaction to one of 5 memory locations. Acheck at the end of a day's transactions gave the counts shown inthe table for each of the 5 memory locations, along with the numberof reported errors.



The bank manager wanted to test whether the proportion of errors intransactions assigned to each of the 5 memory locations differ.


Referring to Table 12-3, which test would be used to properlyanalyze the data in this experiment?

A)2 test for differences between two proportions(related samples)
B)2 test for the differences among more than twoproportions
C)2 test for differences between two proportions(independent samples)
D)2 test of independence

34. A local real estate appraiser analyzed the sales prices ofhomes in 2 neighborhoods to the corresponding appraised values ofthe homes. The goal of the analysis was to compare the distributionof sale-to-appraised ratios from homes in the 2 neighborhoods.Random and independent samples were selected from the 2neighborhoods from last year's homes sales, 8 from each of the 2neighborhoods. Identify the nonparametric method that would be usedto analyze the data.

A)the Wilcoxon Signed-Ranks Test, using the test statisticW
B)the Wilcoxon Rank Sum Test, using the test statisticT1
C)the Wilcoxon Rank Sum Test, using the test statistic Z
D)the Wilcoxon Signed-Ranks Test, using the test statisticZ

35. TABLE 13-2

A candy bar manufacturer is interested in trying to estimate howsales are influenced by the price of their product. To do this, thecompany randomly chooses 6 small cities and offers the candy bar atdifferent prices. Using candy bar sales as the dependent variable,the company will conduct a simple linear regression on the databelow:




Referring to Table 13-2, what is the standard error of theestimate, SYX, for the data?

A)0.784
B)16.299
C)12.650
D)0.885

Explanation / Answer

31.B) numerator df = 3, denominator df = 152 32.C) mean squares 33.B) 2 test for the differences among more than twoproportions 34.B) the Wilcoxon Rank Sum Test, using the test statisticT1 35.B) 16.299

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