Janine is interested in how taking a computer science course affects the salary of college graduates. She asked 20 college graduates that had previously taken computer science and 20 college graduates that had not taken computer science to record their salaries. She found that S65,000 was the average salary for those that took the computer science course and $60,000 was the average salary for those that did not take the computer science course. She estimated that the population standard deviation was $6,000. She decided to use an independent samples t-test with a .05. a What is the effect size of the study? b. What is the power of this study?

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