CHDA EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
Alpha level - ANS The level of Type I error that is deemed acceptable based on context in
statistical hypothesis testing. See Type I error.
Alternative hypothesis - ANS The complement of the null hypothesis that is to be tested using
the appropriate statistical test. This hypothesis typically requires some action to be taken.
Ambulatory payment classification (APC) - ANS The payment unit used in the hospital
outpatient prospective payment system (OPPS). The classification is a resource-based
reimbursement system.
Analysis - ANS Reviewing and summarizing data for use in decision making.
Analysis of variance - ANS The statistical tool used to compare more than two population
means. The null hypothesis tests that all of the population means are equal.
Auditing - ANS "The performance of internal and external reviews (audits) to identify
variations from established baselines (for example, review of outpatient coding as compared
with CMS outpatient coding guidelines)."
Balanced design - ANS An experimental design where the number of subjects in each sample
are the same for all populations sampled. The term is relevant when performing an analysis of
variance or a two sample t-test.
@2026/2027 ALLRIGHTS RESERVED.
, Bell curve - ANS The shape of the normal distribution. The bell pealcs at the average and
slopes down on both sides symmetrically.
Binomial variable - ANS "A variable that talces only two values (such as yes or no; alive or
dead). The probability of a yes or no is constant across all of the subjects, and the outcome of
each subject is independent of the others."
Case Mix Index (CMI) - ANS "The average relative weight of all cases treated at a given facility
or by a given physician, which reflects the resource intensity or clinical severity of a specific
group in relation to the other groups in the classification system; calculated by dividing the sum
of the weights of diagnosis-related groups for patients discharged during a given period by the
total number of patients discharged."
Centers for Medicare and Medicaid Services (CMS) - ANS "The division of the Department of
Health and Human Services that is responsible for developing healthcare policy in the United
States, for administering the Medicare program and the federal portion of the Medicaid
program, and maintaining the procedure portion of the International Classification of Diseases,
ninth revision, Clinical Modification (ICD-9-CM) and International Classification of Diseases,
tenth revision, Procedure Coding System (ICD-10-PCS); called the Health Care Financing
Administration (HCFA) prior to 2001."
Chi squared test - ANS A statistical test that is used to test for relationships between
categorical variables. The null hypothesis for this test is that there is no association between the
two variables. Represented by the symbol X2 (where X is the Greek letter chi.)
Cluster random sampling - ANS "The population is divided into groups before the sample is
selected. The groups or clusters must be mutually exclusive and exhaustive. (That is, every unit
in the population is assigned to one and only one cluster.) Clusters are then randomly selected
to make up the sample. Cluster sampling may be performed as single-stage or two-stage."
Cluster Sampling - ANS Sampling where population is divided into groups (or clusters); groups
are then randomly selected to form sample
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
Alpha level - ANS The level of Type I error that is deemed acceptable based on context in
statistical hypothesis testing. See Type I error.
Alternative hypothesis - ANS The complement of the null hypothesis that is to be tested using
the appropriate statistical test. This hypothesis typically requires some action to be taken.
Ambulatory payment classification (APC) - ANS The payment unit used in the hospital
outpatient prospective payment system (OPPS). The classification is a resource-based
reimbursement system.
Analysis - ANS Reviewing and summarizing data for use in decision making.
Analysis of variance - ANS The statistical tool used to compare more than two population
means. The null hypothesis tests that all of the population means are equal.
Auditing - ANS "The performance of internal and external reviews (audits) to identify
variations from established baselines (for example, review of outpatient coding as compared
with CMS outpatient coding guidelines)."
Balanced design - ANS An experimental design where the number of subjects in each sample
are the same for all populations sampled. The term is relevant when performing an analysis of
variance or a two sample t-test.
@2026/2027 ALLRIGHTS RESERVED.
, Bell curve - ANS The shape of the normal distribution. The bell pealcs at the average and
slopes down on both sides symmetrically.
Binomial variable - ANS "A variable that talces only two values (such as yes or no; alive or
dead). The probability of a yes or no is constant across all of the subjects, and the outcome of
each subject is independent of the others."
Case Mix Index (CMI) - ANS "The average relative weight of all cases treated at a given facility
or by a given physician, which reflects the resource intensity or clinical severity of a specific
group in relation to the other groups in the classification system; calculated by dividing the sum
of the weights of diagnosis-related groups for patients discharged during a given period by the
total number of patients discharged."
Centers for Medicare and Medicaid Services (CMS) - ANS "The division of the Department of
Health and Human Services that is responsible for developing healthcare policy in the United
States, for administering the Medicare program and the federal portion of the Medicaid
program, and maintaining the procedure portion of the International Classification of Diseases,
ninth revision, Clinical Modification (ICD-9-CM) and International Classification of Diseases,
tenth revision, Procedure Coding System (ICD-10-PCS); called the Health Care Financing
Administration (HCFA) prior to 2001."
Chi squared test - ANS A statistical test that is used to test for relationships between
categorical variables. The null hypothesis for this test is that there is no association between the
two variables. Represented by the symbol X2 (where X is the Greek letter chi.)
Cluster random sampling - ANS "The population is divided into groups before the sample is
selected. The groups or clusters must be mutually exclusive and exhaustive. (That is, every unit
in the population is assigned to one and only one cluster.) Clusters are then randomly selected
to make up the sample. Cluster sampling may be performed as single-stage or two-stage."
Cluster Sampling - ANS Sampling where population is divided into groups (or clusters); groups
are then randomly selected to form sample
@2026/2027 ALLRIGHTS RESERVED.
