# Math

### Pre-Algebra Practice Questions: Applying the Engli...

The English system of measurement is most commonly used in the United States. If you were...

### How to Memorize the Multiplication Table

If you have trouble multiplying numbers,...

### Testing a Variance in R

You might think that the function chisq.test() would be the best way to test a variance in...

### Plotting t in ggplot2

The grammar-of-graphics approach takes considerably more effort when plotting the values o...

### Plotting t in Base R Graphics

Visualizing a distribution often helps you understand it. The process can be a bit involve...

### Z Testing in R

An R function called z.test() would be great for doing the kind of testing in which you us...

### The Standard Normal Distribution in R

Working with the standard normal distribution in R couldn’t be easier. The only change y...

### Distributions in R

The normal distribution family is one of many distribution families baked into R. Dealing...

### Step by Step: The Empirical Cumulative Distributio...

The empirical cumulative distribution function (ecdf) is closely related to cumulative fre...

### Statistical Moments and R

In statistics, moments are quantities that are related to the shape of a set of numbers. &...