Descriptive Statistics (Mean, Median, Mode, Std Dev)

Summary

The basic summary numbers for any dataset — mean and median describe the center (and disagree when data is skewed), mode is the most frequent value, and standard deviation describes spread.

How to Learn This

1Calculate all 4 by hand on a small dataset before using a tool.
2Learn why median is more robust to outliers than mean.
3Find a real dataset where mean and median differ noticeably, and explain why.

SQL Case Study: E-commerce Sales Analysis

Probability Basics

More topics in Statistics for Analysts

Probability Basics Distributions (Normal, Binomial)Sampling & Sampling Bias Correlation vs Causation Hypothesis Testing p-values & Confidence Intervals A/B Testing Statistics Regression Basics Outlier Detection Statistical Significance Pitfalls

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