You work at an alcohol and substance abuse treatment center for youth. The treat

Question

You work at an alcohol and substance abuse treatment center for youth. The treatment center just received funding for a new program. One of the goals of the intervention is to improve youths' knowledge and understanding of the effects of substances on their physical and emotional development. A standardized measure is being used to assess youth's knowledge/understanding of physical and emotional development which allows you to compute a score. The evaluation team has decided to have the youth complete the measure before beginning the intervention and a week after the intervention has ended. Which statistical analysis would you use to determine the effectiveness of the new intervention? dependent means t-test for paired sample dependent means t-test for pre- and post test independent means t-test ANOVA

Explanation / Answer

Statistical analysis that would be useful to determine the effectivness of the new intervention is dependent means t-test for paired sample . To understandard this answer , let us learn about this test .

What does this test do?

The dependent t-test (also called the paired t-test or paired-samples t-test) compares the means of two related groups to determine whether there is a statistically significant difference between these means.

What variables do you need for a dependent t-test?

You need one dependent variable that is measured on an interval or ratio scale . You also need one categorical variable that has only two related groups.

What is meant by "related groups"?

A dependent t-test is an example of a "within-subjects" or "repeated-measures" statistical test. This indicates that the same participants are tested more than once. Thus, in the dependent t-test, "related groups" indicates that the same participants are present in both groups. The reason that it is possible to have the same participants in each group is because each participant has been measured on two occasions on the same dependent variable. For example, you might have measured the performance of 10 participants in a spelling test (the dependent variable) before and after they underwent a new form of computerised teaching method to improve spelling. You would like to know if the computer training improved their spelling performance. Here, we can use a dependent t-test because we have two related groups. The first related group consists of the participants at the beginning (prior to) the computerised spell training and the second related group consists of the same participants, but now at the end of the computerised training.

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