Z-Test vs. T-Test
Not what you're looking for?
Need help with one psychological research question that could be answered by each of the following types of statistical tests:
a) Z test and T test for independent samples
b) T test for dependent samples
c) Rationale for both selections so I might be able to understand better
Purchase this Solution
Solution Summary
This solution explains how to use z-tests and t-tests, and highlights when one would be used over the other. Additionally, this solution includes five reference source links for further investigation of the topic.
Solution Preview
Both the z-test and the t-test are used to compare means (means of two samples or the mean of one sample vs. a given number). They both require independent samples taken from normally distributed populations. Here's how you choose which to use.
* You use a z-test when you know the population standard deviation, when you are looking at proportions (rather than means), or when the sample size is large (different people have different cut-off points for how large the sample needs to be -- usually around 30).
* You use a t-test when you can't use a z-test. That is, when ...
Purchase this Solution
Free BrainMass Quizzes
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.
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.
Know Your Statistical Concepts
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.