Question

A researcher wants to determine if eating healthier will help students make less errors on exams. To test this, students were asked to chart how many servings of veggies the ate each day for two weeks prior to the midterm exam. They were then given the midterm exam. Number of errors were counted. They were then asked to increase their intake of veggies by 5 servings each day for the next two weeks, then they were given an exam very similar to the midterm exam. Again, number of errors were counted. When looking at the “before” and “after” scores for these 10 students, the researchers used an a = .05 significance level, and a two-tailed test to determine if students make significantly less errors when eating more veggies than when they did not eat enough veggies, and if so, how strong this effect was (Estimated d proposed by Cohen).

Answer 1

Answer: 0.05

Explanation:

The researcher is interested in determining whether eating healthier will help students make fewer errors on exams. To test this hypothesis, the researcher asked students to chart how many servings of veggies they ate each day for two weeks prior to the midterm exam. The students were then given the midterm exam, and the number of errors was counted. The students were then asked to increase their intake of veggies by 5 servings each day for the next two weeks, and then they were given an exam very similar to the midterm exam. Again, the number of errors was counted.

The researcher used a two-tailed test with a significance level of 0.05 to determine if students made significantly fewer errors when eating more veggies than when they did not eat enough veggies. The effect size was estimated using Cohen’s d.

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