Over the past year, the vice president of human resources at a large medical center conducted a series of three-month workshops aimed at increasing worker motivation and performance. As a check of effectiveness, she selected 7 employees from the personnel files and recorded their most recent annual performance ratings along with the ratings attained prior to attending the workshops. At a 5% level of significance, before after. is there evidence that the workshops increased performance ratings? Take the differences =
Before After
72 59
74 72
62 89
74 67
78 81
88 92
71 81
Take the differences before-after. Order the data smallest to largest, ignoring the negative signs. Rank the data from 1 to 7
Observation 5 had the values Before = 81 and After 78. What is the difference before - after of these values?
What rank will observation 5 receive?
Add up all the ranks that have a negative difference, T . What is the value of T?
Add up all the ranks that have a positive difference,, T+. What is the value of T+?
What is the test statistic, T?