Biostatistics MCQs

1. What is the term for a measure that describes the central value of a dataset? a) Variance b) Mean c) Standard deviation d) Range Answer: b) Mean 2. Which measure of central tendency is most affected by extreme values or outliers? a) Mean b) Median c) Mode d) Variance Answer: a) Mean 3. What is the term for the middle value in a dataset when it is ordered from smallest to largest? a) Mean b) Median c) Mode d) Range Answer: b) Median 4. What measure of central tendency is defined as the value that appears most frequently in a dataset? a) Mean b) Median c) Mode d) Variance Answer: c) Mode 5. What is the term for the measure of dispersion that represents the average squared deviation from the mean? a) Variance b) Standard deviation c) Range d) Interquartile range Answer: a) Variance 6. What is the square root of the variance called? a) Range b) Mean c) Standard deviation d) Median Answer: c) Standard deviation 7. What is the term for the difference between the highest and lowest values in a dataset? a) Variance b) Range c) Standard deviation d) Interquartile range Answer: b) Range 8. What is the term for the measure that divides a dataset into four equal parts? a) Quartiles b) Deciles c) Percentiles d) Median Answer: a) Quartiles 9. What is the term for a dataset where the distribution is symmetrical and bell-shaped? a) Normal distribution b) Skewed distribution c) Uniform distribution d) Exponential distribution Answer: a) Normal distribution 10. What is the probability distribution used to model the number of successes in a fixed number of trials? a) Binomial distribution b) Normal distribution c) Poisson distribution d) Exponential distribution Answer: a) Binomial distribution 11. What is the term for the probability of a given outcome occurring in a dataset? a) Probability b) P-value c) Confidence interval d) Risk Answer: a) Probability 12. What is the term for the probability of observing a result as extreme as or more extreme than the one observed, given that the null hypothesis is true? a) P-value b) Confidence interval c) Power d) Significance level Answer: a) P-value 13. What is the term for the range within which a population parameter is expected to lie with a certain level of confidence? a) Confidence interval b) Hypothesis test c) P-value d) Effect size Answer: a) Confidence interval 14. What is the term for the likelihood of rejecting the null hypothesis when it is true? a) Type I error b) Type II error c) Power d) Significance level Answer: a) Type I error 15. What is the term for the likelihood of failing to reject the null hypothesis when it is false? a) Type II error b) Type I error c) Power d) Significance level Answer: a) Type II error 16. What is the term for the probability of correctly rejecting a false null hypothesis? a) Power b) Significance level c) Type I error d) Type II error Answer: a) Power 17. What is the term for a statistical test that assesses whether there is a significant difference between the means of two groups? a) T-test b) Chi-square test c) ANOVA d) Regression analysis Answer: a) T-test 18. What is the term for a statistical test used to compare the variances of two or more groups? a) F-test b) T-test c) Chi-square test d) Z-test Answer: a) F-test 19. What is the term for a statistical test used to determine if there is a significant association between two categorical variables? a) Chi-square test b) T-test c) ANOVA d) Regression analysis Answer: a) Chi-square test 20. What is the term for a measure that assesses the strength and direction of the linear relationship between two variables? a) Correlation coefficient b) P-value c) Confidence interval d) Effect size Answer: a) Correlation coefficient 21. What is the term for a statistical model that describes the relationship between a dependent variable and one or more independent variables? a) Regression analysis b) ANOVA c) Chi-square test d) T-test Answer: a) Regression analysis 22. What is the term for the proportion of total variability in the dependent variable that is explained by the independent variable(s) in a regression model? a) R-squared b) P-value c) Beta coefficient d) Standard error Answer: a) R-squared 23. What is the term for the statistical technique used to test the significance of the relationship between variables? a) Hypothesis testing b) Descriptive statistics c) Exploratory data analysis d) Data mining Answer: a) Hypothesis testing 24. What is the term for the statistical measure that indicates how much individual data points differ from the mean? a) Standard deviation b) Variance c) Range d) Interquartile range Answer: a) Standard deviation 25. What is the term for the average of the squared deviations from the mean in a dataset? a) Variance b) Standard deviation c) Range d) Mean Answer: a) Variance 26. What is the term for a graphical representation of the distribution of a dataset? a) Histogram b) Scatter plot c) Box plot d) Bar chart Answer: a) Histogram 27. What is the term for a graphical representation that shows the relationship between two continuous variables? a) Scatter plot b) Histogram c) Box plot d) Pie chart Answer: a) Scatter plot 28. What is the term for a statistical technique used to assess the differences between more than two group means? a) ANOVA b) T-test c) Chi-square test d) Regression analysis Answer: a) ANOVA 29. What is the term for the measure of the average distance of each data point from the mean? a) Standard deviation b) Variance c) Range d) Interquartile range Answer: a) Standard deviation 30. What is the term for a hypothesis test where the null hypothesis is rejected only if the test statistic is beyond a certain critical value? a) One-tailed test b) Two-tailed test c) Chi-square test d) T-test Answer: a) One-tailed test 31. What is the term for the range of values within which a population parameter is expected to lie, with a specified level of confidence? a) Confidence interval b) Hypothesis test c) P-value d) Effect size Answer: a) Confidence interval 32. What is the term for the proportion of variance in a dependent variable that is accounted for by an independent variable in a regression model? a) R-squared b) P-value c) Beta coefficient d) Standard error Answer: a) R-squared 33. What is the term for the process of selecting a subset of individuals from a population to estimate characteristics of the whole population? a) Sampling b) Data mining c) Hypothesis testing d) Regression analysis Answer: a) Sampling 34. What is the term for a measure of the strength and direction of the linear relationship between two variables? a) Correlation coefficient b) P-value c) Confidence interval d) Effect size Answer: a) Correlation coefficient 35. What is the term for the statistical technique used to determine if the differences between groups are statistically significant? a) Hypothesis testing b) Descriptive statistics c) Exploratory data analysis d) Data mining Answer: a) Hypothesis testing 36. What is the term for the range of values within which a population parameter is expected to lie with a certain level of confidence? a) Confidence interval b) Hypothesis test c) P-value d) Effect size Answer: a) Confidence interval 37. What is the term for the statistical test that assesses the goodness of fit between observed and expected frequencies in categorical data? a) Chi-square test b) T-test c) ANOVA d) Regression analysis Answer: a) Chi-square test 38. What is the term for a measure that summarizes the center of a dataset? a) Central tendency b) Dispersion c) Distribution d) Correlation Answer: a) Central tendency 39. What is the term for the degree to which two variables move in relation to each other? a) Correlation b) Regression c) Variance d) Distribution Answer: a) Correlation 40. What is the term for a graphical display of the five-number summary of a dataset? a) Box plot b) Histogram c) Scatter plot d) Bar chart Answer: a) Box plot 41. What is the term for a statistical test used to compare the means of three or more groups? a) ANOVA b) T-test c) Chi-square test d) Regression analysis Answer: a) ANOVA 42. What is the term for the analysis that describes the data without making any conclusions? a) Descriptive statistics b) Inferential statistics c) Exploratory data analysis d) Predictive modeling Answer: a) Descriptive statistics 43. What is the term for the statistical error that occurs when the null hypothesis is rejected when it is true? a) Type I error b) Type II error c) Power d) Significance level Answer: a) Type I error 44. What is the term for the statistical error that occurs when the null hypothesis is not rejected when it is false? a) Type II error b) Type I error c) Power d) Significance level Answer: a) Type II error 45. What is the term for the likelihood of correctly rejecting a false null hypothesis? a) Power b) Significance level c) Type I error d) Type II error Answer: a) Power 46. What is the term for a hypothesis test that evaluates whether a parameter is greater than or less than a certain value? a) One-tailed test b) Two-tailed test c) Chi-square test d) T-test Answer: a) One-tailed test 47. What is the term for a hypothesis test that evaluates whether a parameter is significantly different from a certain value? a) Two-tailed test b) One-tailed test c) Chi-square test d) T-test Answer: a) Two-tailed test 48. What is the term for a statistical model that predicts the value of one variable based on another variable? a) Regression analysis b) ANOVA c) Chi-square test d) T-test Answer: a) Regression analysis 49. What is the term for a measure of how closely data points cluster around a central value? a) Variability b) Central tendency c) Dispersion d) Correlation Answer: a) Variability 50. What is the term for a measure of the strength and direction of the linear relationship between two variables? a) Correlation coefficient b) P-value c) Confidence interval d) Effect size Answer: a) Correlation coefficient

Biostatistics MCQs

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