Question

7. Effect size - Cohen's d and r squared Aa Aa E An industrial/organizational psychologist has been consulting with a company that runs weekend job-seeking workshops for the unemployed. She collected data on several issues related to these workshops and, after conducting statistical tests, obtained statistically significant findings. She needs to find a way to evaluate effect size so that she can make recommendations to the company. One of the psychologist's findings is that 1 year after the workshop, a sample of 36 job seekers who received training on using the Internet to find job listings scored an average of 7.3 as measured on a 9-point job-search motivation scale, with a standard deviation of 1.5. The typical job seeker scores 6.1 points. The psychologist finds that the estimated Cohen's d is 0.750 ,the t statistic is 4.80, and r2 is 0.063 . Using Cohen's d and Cohen's guidelines for interpreting the effect size with the estimated Cohen's d, there is a small treatment effect. Using r2 and the extension of Cohen's guidelines for interpreting the effect size using r2, there is a large treatment effect. (Hint: When using Cohen's guidelines for interpreting the effect size, if the value lies between two categories, then specify the range covered by both categories, for example, medium to large.) Another one of the psychologist's findings is that a sample of 121 job seekers who received training on interview skills worked an average of 6.1 hours per week, with a standard deviation of 1.2. The typical job seeker works 5.7 hours. She finds that the estimated Cohen's d is 0.333 , the t statistic is 3.64, and r2 is 0.057 Using Cohen's d and Cohen's guidelines for interpreting the effect size with the estimated Cohen's d, there is a small to medium treatment effect. Using r2 and the extension of Cohen's guidelines for interpreting the effect size with r2, there is a medium treatment effect. small to medium very small medium

Answer 1

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