Caroline Hoxby and Sarah Turner (2013) conducted an experiment to determine whether a simple intervention could increase the number of college applications among low-income students. The intervention consisted of information about the college application process and about college costs that were specific to the student, along with an easy-to-implement waiver of college application fees. The following is an excerpt from a table. The intervention had a statistically significant effect on this variable at a p level of 0.01.

a. Describe the sample and population of this study.

b. What is the independent variable and what are its levels?

c. What is the dependent variable?

d. The finding was statistically significant. Why is this not sufficient to determine that this intervention, which costs about $6 per student, is worthwhile?

e. What is the effect size for the dependent variable? How large is it, according to Cohen€™s conventions?

f. What does this effect size mean in terms of standard deviations in the context of this study?

g. The researchers also included the effect in percentage change. Explain what this means in the context of this study.

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Dependent variable Number of applications submitted Effect in Effect in percentage change effect size 19.0% 0.247