Which outside resource (image, video, article) is a good example of when a researcher did not control for essential variables?

This week is all about analysis of variance.

Please post something to the discussion board related to the content covered this week. For each post, be succinct and professional. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post.

Feel free to explore the features of Yellowdig, such as your ability to embed videos and pictures, create polls, love or like a post, and so on.

Here are some ideas for your post to get you started:

Let’s say you were working on a project examining the effects of studying on test grades. You have three groups that you are comparing—one with learners who didn’t study at all, one with learners who studied two hours or less, and one that studied more than two hours. You run an ANOVA that shows that learners who didn’t study at all had the highest scores on the test. This leaves you somewhat puzzled. How might you explain this result? What factors might you need to control for to make sure you got it right? Share your thoughts and information in Yellowdig. Give your post a hashtag in the body (for example, #screwystats).
Which outside resource (image, video, article) is a good example of when a researcher did not control for essential variables? Share the link within your post. What struck you the most about this example?
What about this week’s content is relevant to your own professional or academic career?

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