CPC PRACTICE EXAM 1 SOLVED QUESTIONS
AND VERIFIED SOLUTIONS
◉ 10.The mean is an appropriate statistic to use to measure which
type of data?
a. Qualitative
b. Nominal
c. Ordinal
d. Ratio.
Answer: Correct Answer: D
Appropriate descriptive statistics for ratio data are mean, median,
standard deviation, range, geometric mean, and coefficient of
variation (White 2016a, 5)
◉ 11.We want to compare the average weight of patients before and
after a specialty diet is administered. We expect the weight to
decrease after administration of the diet. Which of the following
tests should be conducted to determine if the average weight for
each patient is less at the conclusion of the diet?
a. Paired t-test
b. One-sample t-test
c. t-test for two independent sample means
d. Z-test for comparing two population proportions.
,Answer: Correct Answer: A
A paired t-test may be used to compare a variable measured at two
time points on the same subject (White 2016a, 95).
◉ 17.A researcher would like to test the null hypothesis that the
lengths of stay at two hospitals are equal. What statistical test
should the researcher use in this situation?
a. Tukey's HSD
b. t-test for means
c. ANOVA
d. Z-test for proportions.
Answer: Correct Answer: B
A two-sample t-test is a test of a null hypothesis to determine if the
means of two groups are statistically different from each other. An
analyst may want to compare the lengths of stay in two units of a
hospital or two hospitals in the same system (White 2013, 98).
◉ Case Mix Index Formula.
Answer: The Case Mix Index (CMI) is the average relative DRG
weight of a hospital's inpatient discharges, calculated by summing
the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for
each discharge and dividing the total by the number of discharges
◉ Mann-Whitney Test.
,Answer: Non-Parametric Test, 2 samples that have the SAME
shape...even though Whitney is not a MAN
◉ Wilcoxon Signed Rank Test.
Answer: Non Parametric test with Symmetric distribution, sort of
like David Wilcox's even-toned singing (not signing)
◉ Kruskal-Wallis and Friedman's ANOVA.
Answer: Non-Parametric test, same shape and equal VARIANCES.
Because Friedman varies a lot from Chris Wallace!
◉ Nonparametric.
Answer: Less statistical power, more liklely to produce TYPE II Error
◉ Independent Samples T Test is an example of a....
Answer: Parametric Test
◉ paired samples t-test.
Answer: Parametric test used to compare two means for a within-
groups design, a situation in which every participant is in both
samples; also called a dependent-samples t test
◉ One-way ANOVA.
, Answer: PARAMETRIC TEST A statistical test used to analyze data
from an experimental design with one independent variable that has
three or more groups (levels).
◉ nonparametric tests.
Answer: Statistical tests that are distribution free; data do not have
to conform to defined distribution characteristics.
◉ 19.Nonparametric tests such as a Kruskal-Wallis are
advantageous compared to their parametric counterparts for which
of the following reasons?
a. They more efficiently handle large data sets.
b. They are optimized for continuous data.
c. They require more data before drawing conclusions.
d. They require fewer assumptions about the underlying data..
Answer: Correct Answer: D
The Kruskal-Wallis test is a non-parametric test, which means that it
does not assume that the data come from a distribution that can be
completely described by two parameters, mean, and standard
deviation (the way a normal distribution can) (McDonald 2014)
◉ 23.Your chief financial officer has contacted you because your
facility's case-mix index increased last year. He wishes to hear your
theory on why this is so. Among the options below, which would
best explain an increase in the case-mix index?
AND VERIFIED SOLUTIONS
◉ 10.The mean is an appropriate statistic to use to measure which
type of data?
a. Qualitative
b. Nominal
c. Ordinal
d. Ratio.
Answer: Correct Answer: D
Appropriate descriptive statistics for ratio data are mean, median,
standard deviation, range, geometric mean, and coefficient of
variation (White 2016a, 5)
◉ 11.We want to compare the average weight of patients before and
after a specialty diet is administered. We expect the weight to
decrease after administration of the diet. Which of the following
tests should be conducted to determine if the average weight for
each patient is less at the conclusion of the diet?
a. Paired t-test
b. One-sample t-test
c. t-test for two independent sample means
d. Z-test for comparing two population proportions.
,Answer: Correct Answer: A
A paired t-test may be used to compare a variable measured at two
time points on the same subject (White 2016a, 95).
◉ 17.A researcher would like to test the null hypothesis that the
lengths of stay at two hospitals are equal. What statistical test
should the researcher use in this situation?
a. Tukey's HSD
b. t-test for means
c. ANOVA
d. Z-test for proportions.
Answer: Correct Answer: B
A two-sample t-test is a test of a null hypothesis to determine if the
means of two groups are statistically different from each other. An
analyst may want to compare the lengths of stay in two units of a
hospital or two hospitals in the same system (White 2013, 98).
◉ Case Mix Index Formula.
Answer: The Case Mix Index (CMI) is the average relative DRG
weight of a hospital's inpatient discharges, calculated by summing
the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for
each discharge and dividing the total by the number of discharges
◉ Mann-Whitney Test.
,Answer: Non-Parametric Test, 2 samples that have the SAME
shape...even though Whitney is not a MAN
◉ Wilcoxon Signed Rank Test.
Answer: Non Parametric test with Symmetric distribution, sort of
like David Wilcox's even-toned singing (not signing)
◉ Kruskal-Wallis and Friedman's ANOVA.
Answer: Non-Parametric test, same shape and equal VARIANCES.
Because Friedman varies a lot from Chris Wallace!
◉ Nonparametric.
Answer: Less statistical power, more liklely to produce TYPE II Error
◉ Independent Samples T Test is an example of a....
Answer: Parametric Test
◉ paired samples t-test.
Answer: Parametric test used to compare two means for a within-
groups design, a situation in which every participant is in both
samples; also called a dependent-samples t test
◉ One-way ANOVA.
, Answer: PARAMETRIC TEST A statistical test used to analyze data
from an experimental design with one independent variable that has
three or more groups (levels).
◉ nonparametric tests.
Answer: Statistical tests that are distribution free; data do not have
to conform to defined distribution characteristics.
◉ 19.Nonparametric tests such as a Kruskal-Wallis are
advantageous compared to their parametric counterparts for which
of the following reasons?
a. They more efficiently handle large data sets.
b. They are optimized for continuous data.
c. They require more data before drawing conclusions.
d. They require fewer assumptions about the underlying data..
Answer: Correct Answer: D
The Kruskal-Wallis test is a non-parametric test, which means that it
does not assume that the data come from a distribution that can be
completely described by two parameters, mean, and standard
deviation (the way a normal distribution can) (McDonald 2014)
◉ 23.Your chief financial officer has contacted you because your
facility's case-mix index increased last year. He wishes to hear your
theory on why this is so. Among the options below, which would
best explain an increase in the case-mix index?
