A well-known psychology graduate program claims that their Ph.D. graduates get higher-paying jobs than the national average. Last year's figures for salaries paid to all graduates with a psych Ph.D. on their first job showed a mean of $6.20 per hour. A random sample of 10 graduates from last year's class of psychology Ph.D.s showed the following hourly salaries for their first job: $5.40 $6.30 $7.20 $6.80 $6.40 $5.70 $5.80 $6.60 $6.70 $6.90

(a) What is the alternative hypothesis?

(b) What is the null hypothesis?

(c) What can you conclude about the psychology graduate program's claim? Use an alpha level = .052tailed.

(d) What error might you be making by your conclusion in part (c)?

(e) If you were only concerned with evaluating whether salaries increased, how would this effect the power of your experiment?