| Unit 46 | Recollecting Statistical Measures |
From the point of view of exploratory (non--inference-based) data science, statistics answers four important questions:
- Where is the data?
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The sample mean is the average of all observations:
You can use the sample mean to represent the whole sample when the distribution of data is close to normal (“bell-shaped”) and the standard deviation is low.
- How broad is the data?
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The sample standard deviation is the measure of spread and is calculated as the square root of the average square deviation from the sample mean:
High sx means that the data is widely spread.
- How skewed is the data?
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Sample skewness is a ...
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