Inferential Statistics - Chapter 3

Question 1

What are the 2 types of Chi-squared tests?

Answer 1

To test for independence of association between two categorical variables
Example: Is the choice of magazine read associated with the reader’s gender?

As a goodness of fit test
Example: Is the completion time (in minutes) for a task normally distributed?

Question 2

What is regression and what is ANOVA?

Answer 2

Models relationship between variable and one/more independent variables, and ANOVA (Analysis of variance) compares the means of 3 or more groups to determine if at least one group mean is significantly different from the others.

Question 3

What are the null hypothesis and alternative hypothesis testings?

Answer 3

Null (H0): All group means are equal

Alternative (H1): At least one group mean is different from the others.