Practice Questions

166. What technical term describes a measure of association between two variables that ranges from -1 to +1?

A. P-value.

B. T-statistic.

C. Correlation coefficient. ✓

D. Regression coefficient.

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nmdcat.online BS Nursing

Jun 6, 2026

165. A critical situational public health report on the effectiveness of a vaccination program relies solely on the proportion of vaccinated individuals who did not get sick. What is the urgency for a biostatistician to advise caution?

A. To immediately celebrate the program's success.

B. To urgently explain that this is a misleading metric and that a proper comparison with unvaccinated individuals or a calculation of vaccine effectiveness is critically needed. ✓

C. To ignore the unvaccinated group.

D. To assume correlation implies effectiveness.

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nmdcat.online BS Nursing

Jun 6, 2026

164. A medicinal study investigates the relationship between the dose of a drug (continuous) and the presence of a specific side effect (yes/no). Which technical regression model is most appropriate?

A. Linear regression.

B. Logistic regression. ✓

C. Poisson regression.

D. Survival regression.

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nmdcat.online BS Nursing

Jun 6, 2026

163. In a clinical study, researchers are interested in comparing the mean recovery times (continuous) among patients who received one of three different types of surgery. Which technical statistical test is most appropriate?

A. Independent samples t-test.

B. Paired t-test.

C. Chi-square test.

D. One-way ANOVA. ✓

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nmdcat.online BS Nursing

Jun 6, 2026

162. The technical concept of “degrees of freedom” in statistical tests relates to:

A. The number of variables in the study.

B. The number of observations in the sample minus the number of parameters estimated. ✓

C. The significance level.

D. The power of the test.

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nmdcat.online BS Nursing

Jun 6, 2026

161. A critical situational clinical trial is experiencing higher than expected dropout rates from the control group. What is the urgency for a biostatistician to assess the impact?

A. To ignore the dropouts as normal.

B. To urgently assess if the dropout is differential (related to outcome or treatment), as this can introduce selection bias and invalidate the study results. ✓

C. To only analyze complete cases.

D. To recruit more participants.

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nmdcat.online BS Nursing

Jun 6, 2026

160. A medicinal study aims to show that a new drug reduces cholesterol levels. The alternative hypothesis states that the new drug reduces the mean cholesterol level. What technical type of hypothesis test is this?

A. Two-tailed test.

B. One-tailed (right-tailed) test.

C. One-tailed (left-tailed) test. ✓

D. Non-directional test.

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nmdcat.online BS Nursing

Jun 6, 2026

159. A clinical trial compares the mean reduction in symptom severity score for two different drug groups. If the outcome variable is continuous and normally distributed, and the groups are independent, which technical statistical test is most appropriate?

A. Paired t-test.

B. Independent samples t-test. ✓

C. Chi-square test.

D. One-way ANOVA.

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nmdcat.online BS Nursing

Jun 6, 2026

158. What technical term describes the process of systematically organizing and summarizing data?

A. Inferential statistics.

B. Descriptive statistics. ✓

C. Hypothesis testing.

D. Sampling.

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nmdcat.online BS Nursing

Jun 6, 2026

157. A critical situational public health official needs to interpret the results of a study that reports a high correlation coefficient between two variables, but one of the variables is prone to significant measurement error. What is the urgency for a biostatistician’s advice?

A. To assume the correlation is accurate.

B. To urgently explain that measurement error can attenuate (reduce) the observed correlation, potentially masking a stronger true relationship. ✓

C. To ignore the measurement error.

D. To only focus on the correlation coefficient.

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nmdcat.online BS Nursing

Jun 6, 2026

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Practice Questions

166. What technical term describes a measure of association between two variables that ranges from -1 to +1?

165. A critical situational public health report on the effectiveness of a vaccination program relies solely on the proportion of vaccinated individuals who did not get sick. What is the urgency for a biostatistician to advise caution?

164. A medicinal study investigates the relationship between the dose of a drug (continuous) and the presence of a specific side effect (yes/no). Which technical regression model is most appropriate?

163. In a clinical study, researchers are interested in comparing the mean recovery times (continuous) among patients who received one of three different types of surgery. Which technical statistical test is most appropriate?

162. The technical concept of “degrees of freedom” in statistical tests relates to:

161. A critical situational clinical trial is experiencing higher than expected dropout rates from the control group. What is the urgency for a biostatistician to assess the impact?

160. A medicinal study aims to show that a new drug reduces cholesterol levels. The alternative hypothesis states that the new drug reduces the mean cholesterol level. What technical type of hypothesis test is this?

159. A clinical trial compares the mean reduction in symptom severity score for two different drug groups. If the outcome variable is continuous and normally distributed, and the groups are independent, which technical statistical test is most appropriate?

158. What technical term describes the process of systematically organizing and summarizing data?

157. A critical situational public health official needs to interpret the results of a study that reports a high correlation coefficient between two variables, but one of the variables is prone to significant measurement error. What is the urgency for a biostatistician’s advice?

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