Purchase Solution

# Two-Tailed Test

Not what you're looking for?

How to decide whether your test should be one-tailed or two-tailed/directional or non-directional. Gives an example of each type, with an explanation of why it is/is not directional.

##### Solution Summary

How to decide whether your test should be one-tailed or two-tailed/directional or non-directional. Gives an example of each type, with an explanation of why it is/is not directional.

##### Solution Preview

A two-tailed (non-directional) test tests only whether there is a difference between two or more groups/samples/means. A one-tailed (directional) test also tests for differences between groups/samples/means, but it tests for a directional difference between them (ie. whether one is bigger/smaller than another).

Example 1.
The mean grade in last year's Introductory Statistics class was 72, with a standard deviation of 6.2. This year, a new professor taught the course, and the mean grade was 81, ...

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.