An industrial psychologist has designed a study to evaluate the effects of a new profit-sharing incentive plan on productivity for a local organization in New York. The company has 8 teams. The number of units produced by each team during the eight week prior to the beginning of the new incentive plan and for eight weeks afterward is presented below. Test whether the new incentive plan had an effect on productivity at a significance level of .05(non-directional test) by answering the questions below.

BEFORE:85,79,78,80,81,108,76,69

AFTER:89,82,83,78,85,102,80,73

1) What is the appropriate type of test for this question? Why?

2) Present the hypotheses for the test

3) Other than the two assumptions that are common to most hypotheses tests, what additional assumption is made for this question? Provide that assumptiononly

4) Provide the df and the critical value for this test

5) What are the sum of difference scores AND the sum of squared difference scores?

6) Provide the t_observed (you don't have to show the process of computation)

7) What are the decision and the interpretation for the test?