CHDA EXAM 2025/2026 ACTUAL COMPLETE REAL EXAM
QUESTIONS WITH ACCURATE ANSWERS (VERIFIED
ANSWERS) |ALREADY PASSED!! GRADED A+ /2025
NEWEST VERSION!!
If a health plan analyst wanted to determine if the
readmissions rates for two
hospitals were statistically different, which hypothesis test
should be used? -
ANSWER-two-sample Z-test for
proportions
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? - ANSWER-t-test for
means
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? -
ANSWER-paired t-test
The variable that may cause the change in a second variable
is called the -
ANSWER-independent
variable
If the correlation between years of experience and salary is
positive, what can you conclude about the slope of a
regression line that might be fit to describe the relationship? -
ANSWER-the slope will be positive
Which of the following is an assumption made regarding the
residuals in least
squares regression? - ANSWER-the
mean is zero
they are
independent
they are approximately normally
distributed
A sampling technique that divides the population into subsets
and then selects
,a random sample within each subset is called - ANSWER-
stratified random
sampling
In order to increase the precision of a confidence interval
and leave the
confidence level the same, the same size must be -
ANSWER-larger
If an analyst is studying the wait times at a clinic and the only
list of patients
available is hard copy, which sampling technique is the
easiest to use? -
ANSWER-systematic
sampling
What is the biggest problem with using mean length of
stay as a facility
statistic? - ANSWER-it is influenced by
outlier values
Average length of stay is an example of a - ANSWER-
descriptive statistic
, SPSS is a - ANSWER-statistical analysis software package
Where D= dead and A= alive, what is the proportion of patients
that died in the
sample of of
10?
D,D,A,A,A,A,A,A,D,A -
ANSWER-30%
Which of the following attributes is required for a sample to be
statistically valid?
- ANSWER-it must be
reproducible
If an analyst divides the population into groups and randomly
selects groups to
make up the sample, then the sampling technique used is? -
ANSWER-cluster
sampling
The post-operative infection rate for a sample of cases for one
unit in a hospital was 3 percent in a sample of 150 cases. What
ranges represents a 95-percent confidence interval for a the
population post-operative infection rate? - ANSWER-(0.3
percent, 5.7 percent)
QUESTIONS WITH ACCURATE ANSWERS (VERIFIED
ANSWERS) |ALREADY PASSED!! GRADED A+ /2025
NEWEST VERSION!!
If a health plan analyst wanted to determine if the
readmissions rates for two
hospitals were statistically different, which hypothesis test
should be used? -
ANSWER-two-sample Z-test for
proportions
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? - ANSWER-t-test for
means
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? -
ANSWER-paired t-test
The variable that may cause the change in a second variable
is called the -
ANSWER-independent
variable
If the correlation between years of experience and salary is
positive, what can you conclude about the slope of a
regression line that might be fit to describe the relationship? -
ANSWER-the slope will be positive
Which of the following is an assumption made regarding the
residuals in least
squares regression? - ANSWER-the
mean is zero
they are
independent
they are approximately normally
distributed
A sampling technique that divides the population into subsets
and then selects
,a random sample within each subset is called - ANSWER-
stratified random
sampling
In order to increase the precision of a confidence interval
and leave the
confidence level the same, the same size must be -
ANSWER-larger
If an analyst is studying the wait times at a clinic and the only
list of patients
available is hard copy, which sampling technique is the
easiest to use? -
ANSWER-systematic
sampling
What is the biggest problem with using mean length of
stay as a facility
statistic? - ANSWER-it is influenced by
outlier values
Average length of stay is an example of a - ANSWER-
descriptive statistic
, SPSS is a - ANSWER-statistical analysis software package
Where D= dead and A= alive, what is the proportion of patients
that died in the
sample of of
10?
D,D,A,A,A,A,A,A,D,A -
ANSWER-30%
Which of the following attributes is required for a sample to be
statistically valid?
- ANSWER-it must be
reproducible
If an analyst divides the population into groups and randomly
selects groups to
make up the sample, then the sampling technique used is? -
ANSWER-cluster
sampling
The post-operative infection rate for a sample of cases for one
unit in a hospital was 3 percent in a sample of 150 cases. What
ranges represents a 95-percent confidence interval for a the
population post-operative infection rate? - ANSWER-(0.3
percent, 5.7 percent)
