MA 335 Final Exam, Questions With Answers(All 100% Correct)1. TABLE 11-3
A realtor wants to compare the average sales-to-appraisal ratios of residential
... [Show More] properties
sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from
each neighborhood and the ratios recorded for each, as shown below.
A: 1.2, 1.1, 0.9, 0.4 C: 1.0, 1.5, 1.1, 1.3
B: 2.5, 2.1, 1.9, 1.6 D: 0.8, 1.3, 1.1, 0.7
Interpret the results of the analysis summarized in the following table:
Referring to Table 11-3, the among-group degrees of freedom is
A) 3.
B) 4.
C) 16.
D) 12.
2. TABLE 11-3
A realtor wants to compare the average sales-to-appraisal ratios of residential properties
sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from
each neighborhood and the ratios recorded for each, as shown below.
A: 1.2, 1.1, 0.9, 0.4 C: 1.0, 1.5, 1.1, 1.3
B: 2.5, 2.1, 1.9, 1.6 D: 0.8, 1.3, 1.1, 0.7
Interpret the results of the analysis summarized in the following table:
Referring to Table 11-3, the within-group sum of squares is
A) 1.0606.
B) 4.3644.
C) 1.1825.
D) 3.1819.
3. A completely randomized design
A) has one factor and one block and multiple values.
B) can have more than one factor, each with several treatment groups.
C) has one factor and one block.
D) has only one factor with several treatment groups.
4. The F test statistic in a one-way ANOVA is
A) MSA/MSW.
B) SSA/SSW.
C) MSW/MSA.
D) SSW/SSA.
5. TABLE 11-2
An airline wants to select a computer software package for its reservation system. Four
software packages (1, 2, 3, and 4) are commercially available. The airline will choose the
package that bumps as few passengers, on the average, as possible during a month. An
experiment is set up in which each package is used to make reservations for 5 randomly
selected weeks. (A total of 20 weeks was included in the experiment.) The number of
passengers bumped each week is obtained, which gives rise to the following Excel output:
ANOVA
Referring to Table 11-2, the within groups degrees of freedom is
A) 19.
B) 16.
C) 4.
D) 3.
6. TABLE 11-5
A physician and president of a Tampa Health Maintenance Organization (HMO) are
attempting to show the benefits of managed health care to an insurance company. The
physician believes that certain types of doctors are more cost-effective than others. One
theory is that Primary Specialty is an important factor in measuring the cost-effectiveness
of physicians. To investigate this, the president obtained independent random samples of
20 HMO physicians from each of 4 primary specialties - General Practice (GP), Internal
Medicine (IM), Pediatrics (PED), and Family Physicians (FP) - and recorded the total charges
per member per month for each. A second factor which the president believes influences
total charges per member per month is whether the doctor is a foreign or USA medical
school graduate. The president theorizes that foreign graduates will have higher mean
charges than USA graduates. To investigate this, the president also collected data on 20
foreign medical school graduates in each of the 4 primary specialty types described
above. So information on charges for 40 doctors (20 foreign and 20 USA medical school
graduates) was obtained for each of the 4 specialties. The results for the ANOVA are
summarized in the following table.
Referring to Table 11-5, what assumption(s) need(s) to be made in order to conduct the
test for differences between the mean charges of foreign and USA medical school
graduates?
A) The charges in each group of doctors sampled are drawn from normally
distributed populations.
B) The charges in each group of doctors sampled are drawn from populations with
equal variances.
C) There is no significant interaction effect between the area of primary specialty
and the medical school on the doctors' mean charges.
D) All of the above are necessary assumptions.
7. TABLE 12-2
Many companies use well-known celebrities as spokespersons in their TV advertisements.
A study was conducted to determine whether brand awareness of female TV viewers and
the gender of the spokesperson are independent. Each in a sample of 300 female TV
viewers was asked to identify a product advertised by a celebrity spokesperson. The
gender of the spokesperson and whether or not the viewer could identify the product was
recorded. The numbers in each category are given below.
Referring to Table 12-2, at 5% level of significance, the critical value of the test statistic is:
A) 3.8415
B) 13.2767
C) 5.9914
D) 9.4877
8. TABLE 12-18
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds. She
plants all 3 varieties of the seeds on each of 5 different patches of fields. She then
measures the crop yield in bushels per acre. Treating this as a randomized block design,
the results are presented in the table that follows. [Show Less]