t tests

Question 1

What is a t-test?

Answer 1

Statistical method used to compare two groups to see if their means are significantly different.

Question 2

What is a paired t-test for?

Answer 2

For comparing related groups.
Example - seeing if a workout program improves a persons strength - the strength of the same person is being measured twice.

Question 3

What is an unpaired t-test for?

Answer 3

Comparing independent groups.
Example - comparing average test scores of two different classrooms.

Question 4

What is the basic formula used in a t-test?

Answer 4

t = difference in means divided by the SE of the difference.