11 lessons covering everything from data collection to hypothesis testing — each with theory, worked examples, practice questions, and a downloadable worksheet.
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Before any statistics can be calculated, data has to be gathered carefully. How ...
The mean, or average, is the most common measure of central tendency — a single ...
The median is the middle value of an ordered dataset — a measure of central tend...
The mode is the most frequently occurring value in a dataset — the only measure ...
Variance measures how spread out a dataset is around its mean — a small variance...
Standard deviation is the square root of variance — it measures spread in the sa...
A histogram displays the distribution of numeric data by grouping values into in...
A box plot (or box-and-whisker plot) summarizes a dataset's distribution using f...
Regression finds the best-fitting line through a set of data points, letting us ...
Correlation measures the strength and direction of a linear relationship between...
Hypothesis testing is a formal procedure for deciding whether there's enough evi...
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