A-IPC Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Experimental design - CORRECT ANSWER Studies preventions and treatments for diseases;
investigator manipulates which groups receive agent under study
Observational study - CORRECT ANSWER studies causes, preventions, and treatments for
diseases; investigator passively observes things taking course
Cohort - CORRECT ANSWER Examines multiple health effects of an exposure; subjects
defined according to exposure and followed by disease occurrence
Case-control study - CORRECT ANSWER examines multiple exposures in relation to disease;
subjects defined as cases and controls; exposure histories compared
Cross-sectional study - CORRECT ANSWER examines relationship bw exposure and disease
prevalence in defined population at a single point in time
Ecological study - CORRECT ANSWER relationship between exposure an disease with
population level rather than individual level
Null Hypothesis (H0) - CORRECT ANSWER A statement of "no difference."
Type I error (incorrectly rejecting the H0) - CORRECT ANSWER rejecting the null hypothesis
when it is true and attributing significance when there is none. Say there is a difference when there is
none
Type II error - CORRECT ANSWER saying there is no difference when there is one
Incidence - CORRECT ANSWER risk, attack rate (outbreaks), incidence proportion
Standardized infection ratio - CORRECT ANSWER measure that compares HAI rates over
time to compare rates of one facility to the national standard (CLABSI, CAUTI, C. Diff)
QUESTIONS AND CORRECT ANSWERS
Experimental design - CORRECT ANSWER Studies preventions and treatments for diseases;
investigator manipulates which groups receive agent under study
Observational study - CORRECT ANSWER studies causes, preventions, and treatments for
diseases; investigator passively observes things taking course
Cohort - CORRECT ANSWER Examines multiple health effects of an exposure; subjects
defined according to exposure and followed by disease occurrence
Case-control study - CORRECT ANSWER examines multiple exposures in relation to disease;
subjects defined as cases and controls; exposure histories compared
Cross-sectional study - CORRECT ANSWER examines relationship bw exposure and disease
prevalence in defined population at a single point in time
Ecological study - CORRECT ANSWER relationship between exposure an disease with
population level rather than individual level
Null Hypothesis (H0) - CORRECT ANSWER A statement of "no difference."
Type I error (incorrectly rejecting the H0) - CORRECT ANSWER rejecting the null hypothesis
when it is true and attributing significance when there is none. Say there is a difference when there is
none
Type II error - CORRECT ANSWER saying there is no difference when there is one
Incidence - CORRECT ANSWER risk, attack rate (outbreaks), incidence proportion
Standardized infection ratio - CORRECT ANSWER measure that compares HAI rates over
time to compare rates of one facility to the national standard (CLABSI, CAUTI, C. Diff)
