CHDA EXAM QUESTIONS WITH VERIFIED ANSWERS
(GRADED A+)
A manager at your facility believes that elderly females take advantage of free clinical education
offerings more often than elderly males. If proven true, she plans to revamp the educational tools for
the elderly males. Which of the following is the statistical test you would use to test for a relationship
between gender and use of educational offerings?
a. Analysis of variance
b. Chi-square test of independence
c. Regression analysis
d. Descriptive statistics
b. Chi-square test of independence
Standard deviation is intended to measure the _____ of a set of data.
a. Magnitude
b. Central tendency
c. Variability
d. Quantity
c. Variability
The ____ for a one-sample t-test are one less than the sample size, n
degrees of freedom
Which of the following is the statistical test used for differences among more than two means?
a. The confidence interval
b. Analysis of variance
c. Two-tailed t-test
d. Chi-square test of independence
b. Analysis of variance (ANOVA)
Which of the following should be considered when selecting an alpha level for a hypothesis test?
a. The cost of incorrectly rejecting the null hypothesis.
b. Alpha level is 0.05 based on statistical standards.
c. The sample size.
d. 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 percent, what hypothesis test should be completed to determine if GH meets the
standard?
a. Chi square
b. Two-sample Z-test for proportions
, c. t-test
d. One-sample Z-test for proportions
d. One-sample Z-test for proportions
The test statistic used to compare a proportion to a standard is called the one-sample ____ for
proportions (White 2016a, 75).
Z-test
A special case of a categorical variable is a ___, which has two values: yes or no.
binary variable.
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 _____.
a. 30
b. 29
c. 28
d. 31
b. 29
After collecting data for a sample of patients an analyst determines that the patient's BMI explains 31
percent of the variance in the post-operative length of stay for heart bypass patients. What is the
correlation between patient BMI and post-op length of stay?
a. 1.00
b. 0.31 or -0.31
c. 0
d. 0.56 or -0.56
d. 0.56 or -0.56
79. If the least squares regression line modeling wait time as a function of the number of surgeries
scheduled is 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?
a. 10
b. 5
c. 60
d. 70
d. 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 _____.
a. Systematic sampling
b. Stratified sampling
c. Cluster sampling
d. Convenience sampling
(GRADED A+)
A manager at your facility believes that elderly females take advantage of free clinical education
offerings more often than elderly males. If proven true, she plans to revamp the educational tools for
the elderly males. Which of the following is the statistical test you would use to test for a relationship
between gender and use of educational offerings?
a. Analysis of variance
b. Chi-square test of independence
c. Regression analysis
d. Descriptive statistics
b. Chi-square test of independence
Standard deviation is intended to measure the _____ of a set of data.
a. Magnitude
b. Central tendency
c. Variability
d. Quantity
c. Variability
The ____ for a one-sample t-test are one less than the sample size, n
degrees of freedom
Which of the following is the statistical test used for differences among more than two means?
a. The confidence interval
b. Analysis of variance
c. Two-tailed t-test
d. Chi-square test of independence
b. Analysis of variance (ANOVA)
Which of the following should be considered when selecting an alpha level for a hypothesis test?
a. The cost of incorrectly rejecting the null hypothesis.
b. Alpha level is 0.05 based on statistical standards.
c. The sample size.
d. 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 percent, what hypothesis test should be completed to determine if GH meets the
standard?
a. Chi square
b. Two-sample Z-test for proportions
, c. t-test
d. One-sample Z-test for proportions
d. One-sample Z-test for proportions
The test statistic used to compare a proportion to a standard is called the one-sample ____ for
proportions (White 2016a, 75).
Z-test
A special case of a categorical variable is a ___, which has two values: yes or no.
binary variable.
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 _____.
a. 30
b. 29
c. 28
d. 31
b. 29
After collecting data for a sample of patients an analyst determines that the patient's BMI explains 31
percent of the variance in the post-operative length of stay for heart bypass patients. What is the
correlation between patient BMI and post-op length of stay?
a. 1.00
b. 0.31 or -0.31
c. 0
d. 0.56 or -0.56
d. 0.56 or -0.56
79. If the least squares regression line modeling wait time as a function of the number of surgeries
scheduled is 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?
a. 10
b. 5
c. 60
d. 70
d. 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 _____.
a. Systematic sampling
b. Stratified sampling
c. Cluster sampling
d. Convenience sampling
