You are given the job of finding out whether or not changing the lighting in an office from normal fluorescent lighting to red lighting will increase the alertness of data inputters and thereby decrease the number of errors they make. When you do this you find that 20 data inputters decrease their number of errors per day by the following amounts:

22, 22, 12, 10, 42, 19, 20, 19, 20, 21, 21, 20, 30, 28, 26, 18, 18, 20, 21, 19 1.What is the IV in this study?

2.What is the DV in this study?

3.Use SPSSFW to generate a box plot for the above set of scores:

(a) Are the data normally distributed?

(b) Are there any outliers shown on the box plot? If yes, which score(s) is (are) the outliers?

(c) Using SPSSFW, what is the mean of the above set of scores? What is the standard deviation?