Module 6 Assignment

1. Reflecting on the lecture from Module 4 about experiments (see last slide from Module 4b Slides): If you were carrying out an observational study on the impact of playing music over loudspeakers on worker productivity (in a factory setting) how might the Hawthorne Effect compromise your results? What could you do to counteract the Hawthorne Effect?

2. Using the logic from the end of the lecture (Module 6a Slides), suppose we select a random sample of 25 bottles of water as a quality control check on a bottling plant. 

a. The standard deviation of the bottles is .5 ounces. Calculate the standard error. 

b. Now calculate the standard error if we select 49 bottles of water (still with a standard deviation of .5).

c. How does the difference between these two values illustrate the Law of Large Numbers?