CHDA EXAM QUESTIONS WITH VERIFIED ANSWERS
(GRADED A+)
If a survey question asks an open-ended question, what type of data is collected?
Qualitative
Which of the following should be considered when selecting an alpha level for a hypothesis test?
The cost of incorrectly rejecting the null hypothesis
Alpha level is 0.05 based on statistical standards
The sample size
The proportion of successes observed in the data
The cost of incorrectly rejecting the null hypothesis
A sample of 10 patients from General Hospital was selected to determine the rate that prescriptions
were filled after discharge from the facility. 8 of the 10 patients did fill their prescriptions. If the target
for this rate is 95%, what hypothesis test should be completed to determine if the GH meets the
standard?
One-sample Z-test for proportions
Binary variables are useful in calculating _____.
Rates, proportions, percentages
Which of the following measures of central tendency is most affected by extreme values?
Mean
Median
Mode
Geometric mean
Mean
You are conducting a one-sample t-test; the sample contains 30 observations. The number of degrees
of freedom for the one-sample t-test is _____.
29
After collecting data for a sample of patients an analyst determines that the patient's BMI explains
31% of the variance in the post-operative LOS for heart bypass patients. What is the correlation
between patient BMI and post-op LOS?
0.56 or -0.56
, If the least squares regression line modeling wait time as a function of the number of surgeries is
scheduled Y=10+5+X. Where Y is wait time and X is the number of surgeries. What is the predicted
wait time for patients on a day when there are 12 surgeries scheduled?
10
5
60
70
70
You are conducting a patient satisfaction survey in an outpatient clinic. Because you typically see
about 300 people per day in the clinic, you decide to have the interviewers administer the
questionnaire on every tenth patient. You are using _____.
Systematic sampling
What is a random number seed?
The starting point for the random number generator
Which sampling technique includes dividing the population into subsets and randomly selecting a
sample of the members of each subset?
Simple random sampling
Systematic sampling
Cluster sampling
Stratified sampling
Stratified sampling
An analyst wishes to test the impact of a new patient schedule system on number of MRI tests
performed per day. What statistical test should be used?
t-test
t-test for proportions
ANOVA
paired t-test
Paired t-test
Which of these software packages is a RDMS?
Microsoft Access
The first step in hypothesis testing is _____.
Determining the null and alternative hypothesis
Which of the following is true of the median?
(GRADED A+)
If a survey question asks an open-ended question, what type of data is collected?
Qualitative
Which of the following should be considered when selecting an alpha level for a hypothesis test?
The cost of incorrectly rejecting the null hypothesis
Alpha level is 0.05 based on statistical standards
The sample size
The proportion of successes observed in the data
The cost of incorrectly rejecting the null hypothesis
A sample of 10 patients from General Hospital was selected to determine the rate that prescriptions
were filled after discharge from the facility. 8 of the 10 patients did fill their prescriptions. If the target
for this rate is 95%, what hypothesis test should be completed to determine if the GH meets the
standard?
One-sample Z-test for proportions
Binary variables are useful in calculating _____.
Rates, proportions, percentages
Which of the following measures of central tendency is most affected by extreme values?
Mean
Median
Mode
Geometric mean
Mean
You are conducting a one-sample t-test; the sample contains 30 observations. The number of degrees
of freedom for the one-sample t-test is _____.
29
After collecting data for a sample of patients an analyst determines that the patient's BMI explains
31% of the variance in the post-operative LOS for heart bypass patients. What is the correlation
between patient BMI and post-op LOS?
0.56 or -0.56
, If the least squares regression line modeling wait time as a function of the number of surgeries is
scheduled Y=10+5+X. Where Y is wait time and X is the number of surgeries. What is the predicted
wait time for patients on a day when there are 12 surgeries scheduled?
10
5
60
70
70
You are conducting a patient satisfaction survey in an outpatient clinic. Because you typically see
about 300 people per day in the clinic, you decide to have the interviewers administer the
questionnaire on every tenth patient. You are using _____.
Systematic sampling
What is a random number seed?
The starting point for the random number generator
Which sampling technique includes dividing the population into subsets and randomly selecting a
sample of the members of each subset?
Simple random sampling
Systematic sampling
Cluster sampling
Stratified sampling
Stratified sampling
An analyst wishes to test the impact of a new patient schedule system on number of MRI tests
performed per day. What statistical test should be used?
t-test
t-test for proportions
ANOVA
paired t-test
Paired t-test
Which of these software packages is a RDMS?
Microsoft Access
The first step in hypothesis testing is _____.
Determining the null and alternative hypothesis
Which of the following is true of the median?
