# Next steps in statistics

These resources are designed to help understand some key concepts in statistics.

On
Video Written Resource Exercises

Video

#### Variance and standard deviation

Introduction to formulae Video Webpage
Sample variance Sample variance video
Why we divide by (n-1) Why we divide by (n-1)

#### Confidence intervals

Calculating confidence intervals for the mean

Video

Stat Book webpage

#### Relative risk and odds ratios

Relative risk Osmosis Video Boston University webpage
Odds ratios

Odds ratio explained

Psych Scene Hub webpage
Comparing relative risk and odds ratios Video

Guide to odds ratios

Medical statistics definitions, including definitions of relative risks and odds ratios

#### Introduction to correlation

Introduction to correlation

Correlation - the basic idea

Pearson's correlation coefficient

JMP webpage

Exercises
Different measures of correlation   Measures of correlation

#### Simple linear regression

Introduction Stat Trek video   Exercises
Making predictions Video Making predictions

#### Hypothesis testing principles

Principles of hypothesis testing

Hypotheses and Hypothesis tests

P-Values simply explained

Booklet

#### Type I and II errors: power, sample Size, effect size, etc

Power analysis

StatQuest video

Introduction

Power-based calculations
Sample size calculations

Basic principles

Power Based Sample Size Calculations

An Introductin to Sample Size Calculations

Type I and Type II errors Introduction Slideshare presentation
Cohen d (effect size) Calculating Cohen d

#### Introductory Hypothesis tests

Paired vs unpaired data Paired and independent samples
One-Sample T-test
T-tests (paired)

T-test in paired samples

Paired t-tests booklet (PDF, XKB)

T-tests (unpaired)

T-test in unpaired samples

Laerd Statistics webpage

Booklet

Chi-squared test Video

Stat Book exercise

Chi-square test

Fisher's exact test Video Fisher’s Exact test (Word, XKB)