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Home / Community Medicine / Biostatistics

Biostatistics

4 topics in Biostatistics for PGET Paper I Community Medicine. Each one explains the concept simply, then gives exam-focus points and a quick revision list.

Data, presentation and summary measuresThe types of data and scales of measurement, which table or graph suits each, and how to summarise data with the mean, median, mode, range, variance and standard deviation.Normal distribution and probabilityThe shape and properties of the normal (Gaussian) curve, the 68-95-99.7 rule, z-scores, how normal ranges are set, and the basic laws of probability used in medicine.Hypothesis testing, p-values, confidence intervals and errorsThe steps of hypothesis testing, what the null hypothesis, p-value and confidence interval really mean, the standard error of the mean, and type I (alpha) and type II (beta) errors with power.Statistical tests: z, t, ANOVA, chi-square, correlation and regressionHow to choose the right statistical test from the type of data and number of groups, what the z-test, t-tests, ANOVA and chi-square test do, non-parametric alternatives, and how correlation and simple linear regression differ.
Next chapterEpidemiology

All Community Medicine chapters · All PGET subjects

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For education and revision. Not a medical device and not a substitute for clinical judgement, senior advice or your hospital’s protocols. Check every dose against a current drug reference before prescribing. Not affiliated with PMDC, CPSP, NUMS or any hospital.