Statistics Decision Tree

Complete the form below to find out what test you need to run. This is not a comprehensive statistical test repository. It can only tell you about the most common and basic statistical tests, such as, ANOVAs, Chi Squared, and t-tests. If you are making predictions or are comparing samples to a population, please go to the "Making Predictions & Comparisons section" further down on this page. Note: If you recieve a notice of "You should run a Unknown", please consult an advanced statistics book.

Experiments Section:

1. What level or measurement is your dependent variable?

Interval (i.e. 1.5 ml of soda in a can)

Nominal (i.e. Categories: Males and Females)

Ordinal (i.e. Ranks: 1st, 2nd, 3rd, and 4th)

Ratio (i.e. 1 marble)

2. What type of design are you using?

Between-subjects (No repeated measures-Participants only get one variation of the independent variable)

Within-subjects (Repeated measures-Participants get all variations of the independent variable in random order)

3. How many groups do you have?


3 or more

Making Predictions & Comparions:

1. What exactly are you planning to do?

Using ONLY ONE variable to predict another (i.e. Using GRE scores to predict graduate school GPA)

Using MORE THAN ONE variable to predict another (i.e. Using tempurature, precipitation, and fertilizer amounts to predict grain yields)

Comparing a mean of a sample to an already known population (i.e. Comparing ACT scores of students in one state against that of the entire country)