# era 153

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The flashcards below were created by user julidei on FreezingBlue Flashcards.

1. Cohen’s D
• Provides an effect size measure for the independent t-test.
• It indicates the practical importance of a statistically significant t.
2. Confidence Interval of the Difference
• An interval that estimates the difference between the
• populations means represented by two samples in an independent t-test.
3. Correlational
• The term used to define a research design in which there are
• no treatment and control groups.

Correlational studies are also called nonexperimental.
4. Estimated Standard Error of the Mean
• This estimates the standard deviation of the sample means in the distribution of sample means.
• Determined by dividing the sample standard deviation by the square root of the number in the sample, it is a measure of data variability in the t-tests.
• This is abbreviated SEm
5. Experimental
The term used to define a research design in which the subjects are randomly assigned to multiple groups.
6. Independent T-test
A test used to determine whether two independent samples are likely drawn from populations with the same mean.
7. Nonexperimental
• The term used to define a research design in which there are no treatment and control groups.
• Nonexperimental studies are also called correlational.
8. Omega-Squared
This is an effect size measure for the t-test and for analysis of variance. It indicates how much of the variance in the dependent variable can be explained by manipulating the independent.
9. One Sample T Test
• A test that determines whether a sample is likely to have been drawn from a specified population.
• Unlike the z-test, it requires no population standard deviation.
10. One tailed
• A test in which the direction of the significant difference is predicted.
• for example, in t-test, one predicts that the mean of group 1 will be significantly greater, or lesser than the mean of group 2, rather than just significantly different from it.
11. Quasi-Experimental
The term used to define a research design in which there are multiple groups but no random assignment.
12. Standard Error of the Difference
• The statistic in which the within group's variability is pooled from both samples in an independent t-test.
• It is abbreviated SEd
13. Before/After T-Test
Rather than separate groups that the independent-t test test employs, the same group is measured twice, once before the treatment and then after.
14. Two tailed statistical test
• A test in which the only important factor is whether the test statistic is extreme enough that it is not likely to have occured by chance.
• Whether the test statistic is positive or negative does not matter.

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 Author: julidei ID: 142669 Filename: era 153 Updated: 2012-03-20 06:56:02 Tags: fresno state era 153 Folders: Description: era fresno state 153 ch 6 Show Answers:

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