CNR N4000: DR. CHELLY EXAM
COMPREHENSIVE STUDY GUIDE
QUESTIONS AND ANSWERS | 2026/2027
UPDATED | 100% CORRECT
1. In clinical research, which type of error occurs when a researcher fails to reject a null
hypothesis that is actually false?
A. Type I Error
B. Selection Bias
C. Type II Error
D. Confounding Variable
Answer: C
Conceptual Explanation: A Type II error (false negative) occurs when the null hypothesis
is not rejected despite being false, often due to inadequate sample size or power.
2. Which statistical value represents the probability that the observed results occurred by
chance alone?
A. Standard Deviation
B. Confidence Interval
C. P-value
,D. Correlation Coefficient
Answer: C
Conceptual Explanation: The p-value measures the probability that the observed result
occurred by chance; a value less than 0.05 is typically considered statistically significant.
3. In the context of evidence-based practice, which study design is considered the ‘gold
standard’ for determining the efficacy of an intervention?
A. Case-Control Study
B. Cohort Study
C. Randomized Controlled Trial (RCT)
D. Expert Opinion
Answer: C
Conceptual Explanation: RCTs are considered the gold standard because randomization
and control groups minimize bias and establish cause-and-effect relationships.
4. Which ethical principle involves the obligation of the healthcare provider to ‘do no harm’?
A. Autonomy
B. Non-maleficence
C. Beneficence
D. Justice
, Answer: B
Conceptual Explanation: Non-maleficence is the ethical requirement for practitioners to
avoid inflicting unnecessary harm on patients.
5. What is the primary physiological mechanism behind the development of SIADH
(Syndrome of Inappropriate Antidiuretic Hormone)?
A. Excessive water reabsorption due to high ADH levels
B. Excessive water excretion due to ADH deficiency
C. Low serum sodium due to excessive salt intake
D. Kidney resistance to vasopressin
Answer: A
Conceptual Explanation: SIADH involves the excessive secretion of ADH, leading to water
retention, dilutional hyponatremia, and concentrated urine.
6. A patient exhibits a high serum potassium level (7.2 mEq/L) and peaked T-waves on an
EKG. Which medication is most appropriate for urgent stabilization of the cardiac membrane?
A. Sodium Bicarbonate
B. Insulin with Dextrose
C. Calcium Gluconate
D. Sodium Polystyrene Sulfonate
Answer: C
COMPREHENSIVE STUDY GUIDE
QUESTIONS AND ANSWERS | 2026/2027
UPDATED | 100% CORRECT
1. In clinical research, which type of error occurs when a researcher fails to reject a null
hypothesis that is actually false?
A. Type I Error
B. Selection Bias
C. Type II Error
D. Confounding Variable
Answer: C
Conceptual Explanation: A Type II error (false negative) occurs when the null hypothesis
is not rejected despite being false, often due to inadequate sample size or power.
2. Which statistical value represents the probability that the observed results occurred by
chance alone?
A. Standard Deviation
B. Confidence Interval
C. P-value
,D. Correlation Coefficient
Answer: C
Conceptual Explanation: The p-value measures the probability that the observed result
occurred by chance; a value less than 0.05 is typically considered statistically significant.
3. In the context of evidence-based practice, which study design is considered the ‘gold
standard’ for determining the efficacy of an intervention?
A. Case-Control Study
B. Cohort Study
C. Randomized Controlled Trial (RCT)
D. Expert Opinion
Answer: C
Conceptual Explanation: RCTs are considered the gold standard because randomization
and control groups minimize bias and establish cause-and-effect relationships.
4. Which ethical principle involves the obligation of the healthcare provider to ‘do no harm’?
A. Autonomy
B. Non-maleficence
C. Beneficence
D. Justice
, Answer: B
Conceptual Explanation: Non-maleficence is the ethical requirement for practitioners to
avoid inflicting unnecessary harm on patients.
5. What is the primary physiological mechanism behind the development of SIADH
(Syndrome of Inappropriate Antidiuretic Hormone)?
A. Excessive water reabsorption due to high ADH levels
B. Excessive water excretion due to ADH deficiency
C. Low serum sodium due to excessive salt intake
D. Kidney resistance to vasopressin
Answer: A
Conceptual Explanation: SIADH involves the excessive secretion of ADH, leading to water
retention, dilutional hyponatremia, and concentrated urine.
6. A patient exhibits a high serum potassium level (7.2 mEq/L) and peaked T-waves on an
EKG. Which medication is most appropriate for urgent stabilization of the cardiac membrane?
A. Sodium Bicarbonate
B. Insulin with Dextrose
C. Calcium Gluconate
D. Sodium Polystyrene Sulfonate
Answer: C
