NAPLEX Biostatistics Questions with Correct Answers (Grade A+)
Question 1: continuous data
Answer: values that increase or decrease by the same amount; interval or ratio
Question 2: interval data
Answer: continuous data with no meaningful zero (ex. temperature)
Question 3: ratio data
Answer: continuous data with meaningful zero (ex. HR)
Question 4: discrete/categorial data
Answer: categories
Question 5: nominal data
Answer: categorical data in arbitrary categories (ex. M vs. F)
Question 6: ordinal data
Answer: categorical data ranked in logical order but not increasing by the same amount (ex. pain scale)
Question 7: What are the 3 measures of central tendency?
Answer: mean, median, mode
Question 8: When is mean used?
Answer: for continuous data that is normally distributed
Question 9: When is median used?
Answer: for ordinal data or continuous data that is skewed
Question 10: When is mode used?
Answer: for nominal data
Question 11: Gaussian distribution
Answer: normal distribution; mean = median = mode
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, Question 12: In normally distributed data, ___% is within 1 standard deviation.
Answer: 68%
Question 13: In normally distributed data, ___% is within 2 standard deviations.
Answer: 95%
Question 14: In normally distributed data, ___% is within 3 standard deviations.
Answer: 99.7%
Question 15: When is skewed data common?
Answer: small sample size or outliers
Question 16: skewed right
Answer: outlier on the right; positive
Question 17: skewed left
Answer: outlier on the left; negative
Question 18: variable
Answer: any data point that can be measured/counted
Question 19: null hypothesis
Answer: no statistically significant difference
Question 20: alternative hypothesis
Answer: statistically significant difference
Question 21: alpha (statistics)
Answer: error margin; threshold to reject the null hypothesis; usually 0.05
Question 22: confidence interval
Answer: a range of values so defined that there is a specified probability that the value of a parameter lies
within it; 1 - alpha (usually 95%)
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Question 1: continuous data
Answer: values that increase or decrease by the same amount; interval or ratio
Question 2: interval data
Answer: continuous data with no meaningful zero (ex. temperature)
Question 3: ratio data
Answer: continuous data with meaningful zero (ex. HR)
Question 4: discrete/categorial data
Answer: categories
Question 5: nominal data
Answer: categorical data in arbitrary categories (ex. M vs. F)
Question 6: ordinal data
Answer: categorical data ranked in logical order but not increasing by the same amount (ex. pain scale)
Question 7: What are the 3 measures of central tendency?
Answer: mean, median, mode
Question 8: When is mean used?
Answer: for continuous data that is normally distributed
Question 9: When is median used?
Answer: for ordinal data or continuous data that is skewed
Question 10: When is mode used?
Answer: for nominal data
Question 11: Gaussian distribution
Answer: normal distribution; mean = median = mode
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, Question 12: In normally distributed data, ___% is within 1 standard deviation.
Answer: 68%
Question 13: In normally distributed data, ___% is within 2 standard deviations.
Answer: 95%
Question 14: In normally distributed data, ___% is within 3 standard deviations.
Answer: 99.7%
Question 15: When is skewed data common?
Answer: small sample size or outliers
Question 16: skewed right
Answer: outlier on the right; positive
Question 17: skewed left
Answer: outlier on the left; negative
Question 18: variable
Answer: any data point that can be measured/counted
Question 19: null hypothesis
Answer: no statistically significant difference
Question 20: alternative hypothesis
Answer: statistically significant difference
Question 21: alpha (statistics)
Answer: error margin; threshold to reject the null hypothesis; usually 0.05
Question 22: confidence interval
Answer: a range of values so defined that there is a specified probability that the value of a parameter lies
within it; 1 - alpha (usually 95%)
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