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Introduction To Biostatistics

195 questions found

Practice Questions

64. What technical distribution is characterized by a bell-shaped curve and is symmetric around its mean?

A. Binomial distribution.

B. Poisson distribution.

C. Normal distribution. ✓

D. Uniform distribution.

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nmdcat.online BS Nursing

Jun 6, 2026

49. In hypothesis testing, what technical term represents the hypothesis that there is no effect or no difference?

A. Alternative hypothesis.

B. Research hypothesis.

C. Null hypothesis. ✓

D. Statistical hypothesis.

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nmdcat.online BS Nursing

Jun 6, 2026

50. A critical situational decision needs to be made about whether to continue a clinical trial for a new drug that has shown very small, but statistically significant, benefits in early analyses. What urgency is involved in considering both statistical and clinical significance?

A. To immediately stop the trial because of small benefits.

B. To weigh the statistical significance against the clinical relevance and potential harms, recognizing that a statistically significant effect may not be clinically meaningful. ✓

C. To continue the trial regardless of clinical significance.

D. To only consider the p-value.

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nmdcat.online BS Nursing

Jun 6, 2026

51. What technical term describes a graphical representation of the distribution of a continuous variable, where data are grouped into bins?

A. Bar chart.

B. Pie chart.

C. Histogram. ✓

D. Scatter plot.

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nmdcat.online BS Nursing

Jun 6, 2026

52. In a clinical study, researchers want to model the probability of developing a certain disease based on multiple risk factors (e.g., age, smoking status, family history). Which technical regression model is most appropriate for a binary outcome (disease/no disease)?

A. Simple linear regression.

B. Multiple linear regression.

C. Multiple logistic regression. ✓

D. Poisson regression.

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nmdcat.online BS Nursing

Jun 6, 2026

53. A medicinal study aims to determine if a new drug is non-inferior to an existing drug. What critical difference in hypothesis testing approach is required compared to a superiority trial?

A. The null hypothesis assumes the new drug is inferior by a pre-specified margin. ✓

B. The null hypothesis assumes the new drug is superior.

C. The significance level is ignored.

D. Non-inferiority trials do not use hypothesis testing.

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nmdcat.online BS Nursing

Jun 6, 2026

54. A situational survey asks respondents to rate their pain on a scale of 0 to 10. What technical type of data is this?

A. Nominal.

B. Ordinal. ✓

C. Interval.

D. Ratio.

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nmdcat.online BS Nursing

Jun 6, 2026

55. What technical term represents the entire group of individuals or objects about which information is desired?

A. Sample.

B. Statistic.

C. Population. ✓

D. Parameter.

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nmdcat.online BS Nursing

Jun 6, 2026

56. A clinical research team wants to visualize the survival experience of two different patient groups over time. Which technical plot is commonly used for this purpose?

A. Histogram.

B. Scatter plot.

C. Kaplan-Meier curve. ✓

D. Box plot.

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nmdcat.online BS Nursing

Jun 6, 2026

57. A medicinal study finds a statistically significant result (p < 0.05), but the sample size was very small. What critical implication does this have for the reliability of the finding?

A. Small sample size makes the finding more reliable.

B. Small sample size can lead to unstable estimates and findings that may not replicate in larger studies. ✓

C. The p-value is always accurate regardless of sample size.

D. The study had high power.

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nmdcat.online BS Nursing

Jun 6, 2026

58. A situational public health researcher wants to compare the average number of physical activity hours per week across four different age groups. 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

59. What technical concept allows us to use sample statistics to make inferences about population parameters?

A. Descriptive statistics.

B. Probability.

C. Inferential statistics. ✓

D. Data visualization.

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nmdcat.online BS Nursing

Jun 6, 2026

60. In a clinical trial, researchers are concerned that some unknown confounding variables might influence the treatment effect. What critical statistical technique used in study design helps balance these unknown confounders across treatment groups?

A. Matching.

B. Stratification.

C. Randomization. ✓

D. Blinding.

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nmdcat.online BS Nursing

Jun 6, 2026

61. What technical term describes the value that occurs most frequently in a dataset?

A. Mean.

B. Median.

C. Mode. ✓

D. Range.

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nmdcat.online BS Nursing

Jun 6, 2026

46. A clinical researcher is conducting a study where each patient serves as their own control (e.g., measuring blood pressure before and after treatment for each patient). Which technical statistical test is most appropriate for comparing the ‘before’ and ‘after’ measurements?

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

62. A medicinal study reports a 95% confidence interval for the mean increase in a biomarker as (?0.5,2.0). What is the critical interpretation?

A. The drug definitely increases the biomarker.

B. The drug definitely decreases the biomarker.

C. The confidence interval includes zero, suggesting no statistically significant effect of the drug on the biomarker. ✓

D. The drug is highly effective.

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nmdcat.online BS Nursing

Jun 6, 2026

47. A medicinal study reports a confidence interval for the mean treatment effect as (0.1,0.5). What is the critical interpretation regarding the null hypothesis of no effect?

A. The null hypothesis of no effect is likely true.

B. The null hypothesis of no effect can be rejected because the interval does not include zero. ✓

C. The drug is harmful.

D. The confidence interval is too wide.

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nmdcat.online BS Nursing

Jun 6, 2026

48. A situational research project involves measuring the height of students in a class. What technical type of variable is height?

A. Nominal.

B. Ordinal.

C. Discrete.

D. Continuous. ✓

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nmdcat.online BS Nursing

Jun 6, 2026

33. A researcher reports that a study had a power of 0.80. What does this technical term mean?

A. The probability of making a Type I error is 20%.

B. The probability of correctly rejecting the null hypothesis when it is false is 80%. ✓

C. The probability of making a Type II error is 80%.

D. The significance level is 0.20.

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nmdcat.online BS Nursing

Jun 6, 2026

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Introduction To Biostatistics

Practice Questions

64. What technical distribution is characterized by a bell-shaped curve and is symmetric around its mean?

49. In hypothesis testing, what technical term represents the hypothesis that there is no effect or no difference?

50. A critical situational decision needs to be made about whether to continue a clinical trial for a new drug that has shown very small, but statistically significant, benefits in early analyses. What urgency is involved in considering both statistical and clinical significance?

51. What technical term describes a graphical representation of the distribution of a continuous variable, where data are grouped into bins?

52. In a clinical study, researchers want to model the probability of developing a certain disease based on multiple risk factors (e.g., age, smoking status, family history). Which technical regression model is most appropriate for a binary outcome (disease/no disease)?

53. A medicinal study aims to determine if a new drug is non-inferior to an existing drug. What critical difference in hypothesis testing approach is required compared to a superiority trial?

54. A situational survey asks respondents to rate their pain on a scale of 0 to 10. What technical type of data is this?

55. What technical term represents the entire group of individuals or objects about which information is desired?

56. A clinical research team wants to visualize the survival experience of two different patient groups over time. Which technical plot is commonly used for this purpose?

57. A medicinal study finds a statistically significant result (p < 0.05), but the sample size was very small. What critical implication does this have for the reliability of the finding?

58. A situational public health researcher wants to compare the average number of physical activity hours per week across four different age groups. Which technical statistical test is most appropriate?

59. What technical concept allows us to use sample statistics to make inferences about population parameters?

60. In a clinical trial, researchers are concerned that some unknown confounding variables might influence the treatment effect. What critical statistical technique used in study design helps balance these unknown confounders across treatment groups?

61. What technical term describes the value that occurs most frequently in a dataset?

46. A clinical researcher is conducting a study where each patient serves as their own control (e.g., measuring blood pressure before and after treatment for each patient). Which technical statistical test is most appropriate for comparing the ‘before’ and ‘after’ measurements?

62. A medicinal study reports a 95% confidence interval for the mean increase in a biomarker as (?0.5,2.0). What is the critical interpretation?

47. A medicinal study reports a confidence interval for the mean treatment effect as (0.1,0.5). What is the critical interpretation regarding the null hypothesis of no effect?

48. A situational research project involves measuring the height of students in a class. What technical type of variable is height?

33. A researcher reports that a study had a power of 0.80. What does this technical term mean?

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