Learn statistics
Short lessons written around the screening tests employers use. Read one, then take the test.
Describing data: averages, spread and distributionsWhen to use mean, median or mode, how to calculate standard deviation by hand, and what the normal distribution tells you.Lesson 1
Hypothesis tests, p-values and confidence intervalsHow to read p-values correctly, the two error types, how sample size affects precision, and why correlation is not causation.Lesson 2
Probability basics and sampling: the rules behind every test questionHow to combine probabilities with AND and OR, work out conditional probability from a table, and recognise biased samples.Lesson 3
Correlation coefficient and simple regression by handHow to calculate Pearson r from a small dataset, read its sign and size, and fit and interpret a straight-line prediction.Lesson 4
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