What do you do if you have more than two groups? Or more than two independent variables?

One important difference between a t-test and a correlation is that t-tests compare two groups, while correlation compares two variables. Let’s take a moment to consider the difference between a group and a variable. If we are studying depression, we could have one group of people with depression and one group of people without depression. In this example, we are looking for a difference between the groups. On the other hand, we could rate how depressed people were (from not depressed at all to severely depressed). In this case, depression is a variable.
What do you do if you have more than two groups? Or more than two independent variables? That’s where analysis of variance (ANOVA) comes in, and it’s a powerful tool that allows us to compare more than two groups or variables at the same time.
What if your data are names and not numbers? We often look at data that are names (nominal data). The chi-square test is the tool to use when you have nominal data for one of your variables.
This assessment will have you demonstrate your knowledge of correlations, ANOVAs, and chi-square tests. You’ll again consider statistics-related careers as well. You’ll also continue to work with your data for Assessment 4.
Note: The assessments in this course build upon each other, so you are strongly encouraged to complete them in sequence.
Before you begin the assessment, complete the following:
Download the Planning for Your Data [DOCX] worksheet.
Below are the data files for your reference:
Note: The GSS Data 2018 [XLSX] has all of the data for all of the variables. The other files are JASP-compatible files with two variables each. These data files are labeled with the names of the two variables. To find the data file for your specific project, look for the file that names both of your variables.
News and Depress [CSV].
News and Happy [CSV].
News and Life [CSV].
News and Mntlhlth [CSV].
Raclive and Depress [CSV].
Raclive and Happy [CSV].
Raclive and Life [CSV].
Raclive and Mntlhlth [CSV].
Wwwhr and Depress [CSV].
Wwwhr and Happy [CSV].
Wwwhr and Life [CSV].
Wwwhr and Mntlhlth [CSV].
Find another opening (different from the one you picked for Assessment 1) for a job you could apply for with a bachelor’s degree that requires the use of statistics—some good, key search terms: psychology research assistance or survey data analysis.

 

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