#### "Any realistic model of a real-world phenomenon must take into account the possibility of randomness... [M[ore often than not, the quantities we are interested in... will exhibit an inherent variation that should be taken into account by the model."

Sheldon Ross

# Bro. Brown's statistics reference pages

Here are links to pages concerning various topics and tools from introductory (and sometimes intermediate) statistics. Some of these pages are brief, formal reviews. Some aren't so brief or formal! Some are done in the style of actual classroom experiences.

As with most of the site, this page and the pages it links to are very much under construction. Only that which is blue and underlined is an active link. Please report any broken active links, typos, and other errors to Brother Brown at brownd@byui.edu. Thanks!

**To help you understand some basic statistical concepts, I recommend the Java applets for statistics on the disk that comes with your statistics text**. True, it can be annoying to learn how to use applets, but doing so gives you another skill set and that much more power over your own learning. You'll know you've arrived when you find yourself playing with the applets, asking---and answering---"what if?" questions, and maybe even having some fun with it.

**Basic Issues in Statistics**

** Principles of Statistics**

### Randomness and Statistics

#### Part 1: Statistics are random

#### Part 2: Variability of Statistics

#### Part 3: Bias in statistics

### Infinite populations

### Distributions of Sample Means

An activity I sometimes use in class to create hooks in the students' minds, upon which a description of the distribution of sample means may be hung.

**Descriptive Statistics**

** Graphs, plots and charts**

### Frequency and relative frequency

### Measures of location

### Measures of center

### Measures of variability

### Proportions

### Measures of association

### Pearson’s correlation coefficient

### The coefficient of determination

### Least-squares linear regression

### Crosstabulation

### Exploratory data analysis

## Interval estimation

### Confidence intervals

### Confidence limits

### Prediction intervals

**Hypothesis Testing**

### Introduction to hypothesis tests

### The steps of an hypothesis test

### Exercises in writing hypotheses