Purchase Solution

# Hypothesis Testing: Explain the Difference between a Left-Tailed, Two-Tailed, and Right-Tailed Test

Not what you're looking for?

Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypotheses? How can we tell which direction (or no direction) to make the hypothesis by looking at the problem statement (research question)?

##### Solution Preview

(1) Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test?

The three types of tests are very similar.

When you want to test whether a parameter (mean/percentage/correlation/etc.) of a population is greater than a given number or if it is greater than the mean/percentage/correlation of another population, you use a right-tailed test. In this case, you reject the null hypothesis if the observed statistic (the value of z, t, r, etc. that you calculate) is larger than the positive critical value (i.e. if the observed z is greater than 1.96).

When you want to test whether a parameter of a population is less than a given number or if it is less than the parameter of another population, you use a left-tailed test. In this case, you reject the null hypothesis if the observed statistic (the value of z, t, r, etc. that ...

##### Free BrainMass Quizzes

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### 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.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Measures of Central Tendency

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