effects EXERCISES 1. The stress levels of 30 unemployed laborers were measured by a questionnaire before and after a real job interview. The stress level rose from a mean of 63 points to a mean of 71 points. The (unbiased) standard deviation of the difference scores was 18 a. What is the appropriate null hypothesis for this example? b. What is the critical value of t for a .05. 3. two-tailed test? c. What is the observed (i.e., calculated) value of t? d. What is your statistical decision with respect to the null hypothesis? e. Given your conclusion in part d, could you be making a Type I or Type II error? 2. In Exercise 7B9, participants in an individ- ual motivation condition were compared to others in a group motivation condition in terms of task performance. Now assume that the participants had been matched in pairs based on some pretest. The data from Exercise 7B9 follow, showing the pairing of the partici

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