Calculate the effect size.

A college admissions officer wants to know if visiting the campus affects people’s perceptions of the college. He has seven people fill out an attitude toward the college questionnaire before the campus visit, during the visit (at lunch), and after the visit. The data are collected on a 7-point Likert scale with higher numbers indicating more positive attitudes. The data he collects are as follows.

Time Mean
Before 2.43
During/at lunch 3.43
After 5.57


Ans: 36/(36+11) = 0.766

Education

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