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CPH Exam: Biostatistics with correct answers

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  • Course
  • Biostatistics
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  • Biostatistics

CPH Exam: Biostatistics with correct answers

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  • October 29, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Biostatistics
  • Biostatistics
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BukayoSaka120
CPH Exam: Biostatistics with correct
answers

Biostatistics definition: - correct answer ✔✔The development and application of statistical reasoning and
methods in addressing, analyzing, and solving problems in public health, health care, biomedical, clinical,
and population-based research.



Population - correct answer ✔✔the collection of all units (usually people) that we wish to make
inferences about.



Sample - correct answer ✔✔a subset of the population



Bias - correct answer ✔✔*a systematic error in a study that leads to uncertainty about the estimates
generated from the study.

*actually caused by the investigators in the design or conduct of the study



Paramaters - correct answer ✔✔Summary measures based on population data



Statistics - correct answer ✔✔estimates derived from sample data



Descriptive statistics - correct answer ✔✔involves describing the data collected in the study sample



Inferential statistics - correct answer ✔✔involves generating inferences about population parameters
based on estimates derived from the study sample.



Discrete variables - correct answer ✔✔*variables that assume only a finite number of values

*Ex. whether or not a participant is taking lipid lowering treatment (yes or no), their blood type (A, B, AB
or O), or symptom severity (none, mild, moderate, or severe).

, Dichotomous - correct answer ✔✔Discrete variables with two response options



Categorical/nominal - correct answer ✔✔discrete variables with more than 2 unordered response
options



Ordinal variables - correct answer ✔✔discrete variables with more than 2 ordered response options



Continuous variables (quantitative) - correct answer ✔✔*can take on any value within a range of
plausible values.

*Ex. total serum cholesterol level, height, weight and systolic blood pressure



Time to event variables - correct answer ✔✔reflect the time to a particular event such as a heart attack,
cancer remission or death



Continuous variables summarized by: - correct answer ✔✔*measures of central tendency and variability.



Central tendency and variability: - correct answer ✔✔*mean and standard deviation.

*when there are outliers, use median and interquartile range(Q3-Q1)



standard deviation equation: - correct answer ✔✔...



Outliers - correct answer ✔✔*values either abouve Q3 + 1.5(Q3-Q1) or below Q1-1.5(Q3-Q1)



Categorical and ordinal variables bet summarized by: - correct answer ✔✔*frequency (count) and
proportio nor relative frequency of participants in each response category.



Bar chart - correct answer ✔✔*used to summarize a categoricla or nominal variable



Histogram - correct answer ✔✔*used to summarize ordinal data.

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