Normal Distribution Explained: Properties, Z-Scores and Real-World Examples

Statistics

Statistics · Probability DistributionsNormal Distribution ExplainedWhy the bell curve appears everywhere in nature, economics and social science — and how to use it to calculate probabilities.Human heights, IQ scores, measurement errors, financial returns, and blood...

What is Standard Deviation? Formula, Calculation and Examples

Statistics

Statistics · VariabilityWhat is Standard Deviation?The most widely used measure of spread — how it works, how to calculate it, and why it matters more than the range.The mean tells you where the centre of your data is — but it tells you nothing about how spread out...

Mean, Median and Mode: Definitions, Differences and Examples

Statistics

Statistics · Descriptive StatisticsMean, Median and ModeThe three measures of central tendency — what they are, how to calculate them, and which one to use depending on your data.When economists analyse income data or teachers review exam scores, they need a single...

Type I vs Type II Errors: A Way to Never Confuse Them Again

Statistics

Statistics · InferenceType I vs Type II Errors: A Way to Never Confuse Them AgainA false positive and a false negative. Everyone mixes them up. Here’s the mnemonic, the trade-off nobody explains, and why one error is usually worse than the other.Every...

What a P-Value Actually Means (And the Three Things It Doesn’t)

Statistics

Statistics · InferenceWhat a P-Value Actually Means (And the Three Things It Doesn’t)The most used and most misunderstood number in science. If you can state what it really means, you’re ahead of a frightening number of published researchers.You ran...

Standard Deviation vs Standard Error: What’s the Difference?

Statistics

Statistics · FoundationsStandard Deviation vs Standard Error: What’s the Difference?They sound the same, they’re one letter apart in your output, and mixing them up is the most common mistake in undergraduate statistics. Here’s the difference,...

Hypothesis Testing in Economics: t-Tests, p-Values, and Statistical Significance

Econometrics, Statistics

Hypothesis Testing in Economics How do economists decide if something is actually true — or just a lucky coincidence? So… what even is hypothesis testing? Okay, let’s start with a simple question. Say you flip a coin 10 times and get 7 heads. Is the coin rigged?...

Ordinary Least Squares (OLS): Derivation, Assumptions, and Why Omitted Variable Bias Ruins Everything

Econometrics, Regression Analysis, Statistics

Introduction: The Workhorse of Empirical Economics Almost every empirical claim you have ever read in economics — that education raises earnings, that minimum wages do or do not cost jobs, that carbon taxes reduce emissions — rests on a regression. Usually an ordinary...

Cracking Economic Indicators: A Beginner’s Guide to Market Signals

Basic Economics Goals, Development Economics, Macroeconomics, Microeconomics

In the world of finance and investing, economic indicators play a crucial role in providing valuable insights into the overall health and direction of the economy. These indicators serve as important signals, guiding investors, policymakers, and businesses in making...

Complete EconTutorials Content Library

Econometrics, Macroeconomics, Microeconomics, Misc, Statistics

Welcome to the EconTutorials Content LibraryEverything published on EconTutorials — in one place, organised by subject. Whether you’re studying for AP Economics, Cambridge A-Level, IB, or undergraduate exams, use this page to find exactly what you need.🛒...