Hypothesis: Increasing illumination increases speed of productivity among piecework employees. Two groups are randomly selected from among the piecework employees at the Hawthorne Electric Company. Each subject is given 100 transistors to solder to the connecting relays. The time taken (in hours) is recorded for each subject to complete the task. Group Aworks under normal plant lighting conditions, while for Group B, the illumination level is increased by 50%. Their scores are as follows:

Group A: 6.50, 5.00, 3.90, 4.20, 4.50, 6.20, 5.30 Group B: 5.00, 4.00, 3.00, 3.50, 3.70, 4.20, 3.70

a. Do you reject the null hypothesis?

b. Is there a significant difference in the speed of productivity scores between Groups Aand B?

c. What type of research is this, post facto or experimental?

d. Identify both the IV and DV.