Get an explanation of chi-square curves and a demonstration of how to read a chi-square table.
- Chi-square is an interesting distribution in that,…as you might guess, we square something…but what is it that we square?…Let's say we have at normal distribution.…The distribution is centered at zero…and the x-axis represents the different numbers…in this distribution.…These values on the x-axis are the ones…that we're going to square.…Since we're squaring these values,…our chi-square distribution will only have positive numbers.…
The height of the curve represents the likelihood…of that particular outcome.…In other words, the y-axis represents probability.…According to the distribution,…most of the numbers in the distribution are near zero.…So, our chi-square distributions will often look like this.…Now, chi-square distributions allow us to see…how multiple independent variables interacts.…
In other words, instead of just…one normally distributed variable,…we can have two or more.…Using our seasonal birthrate example,…imagine that winter is normally distributed,…spring is normally distributed, and so our summer and fall.…
- Working with small sample sizes
- Using t-statistic vs. z-statistic
- Calculating confidence intervals with t-scores
- Comparing two populations (proportions)
- Comparing two population means
- Chi-square testing
- ANOVA testing
- Regression testing
Skill Level Advanced
1. The Statistics Series: A Look Back and Forward
2. Small Sample Sizes
T-statistic vs. z-statistic3m 44s
3. Comparing Two Populations (Proportions)
4. Comparing Two Populations (Means)
6. ANOVA: Analysis of Variance
7. Introduction to Regression
Next steps1m 40s
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