Statistics describes and analyzes data. Measures of central tendency (mean, median, mode) indicate where data clusters. Measures of spread show how da
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When is the median more useful than the mean?
Use median when data is skewed or has outliers. For example, in income data, a few very high earners pull the mean up while the median reflects typical income better.
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What does a standard deviation of zero mean?
All data values are identical (no variation). Every value equals the mean. This is common in controlled experiments or constant measurements.
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How do you find quartiles from a dataset?
Order the data. Q2 is the median. Q1 is the median of the lower half. Q3 is the median of the upper half. Different methods handle odd-numbered data slightly differently.
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