Statistics

A facility manager wants to know if lighting levels (low, diffused, bright) effect customer rating of the room. Use the following output to determine if there is evidence that Satisfaction ratings are the same for the lighting levels. Answer 1) one tailed or two tailed test? 2) Calculated Chi- square = ___? 3) Degrees of freedom = ___?

low diffused bright Total

Happy 34 15 18 67

21.56 22.72 22.72

7.177 2.623 0.980

Okay 20 20 25 65

20.92 22.04 22.04

0.040 0.189 0.397

Neutral 20 38 12 70

22.53 23.74 23.74

0.283 8.570 5.803

Un-happy 19 25 43 87

28.00 29.50 29.50

2.891 0.687 6.176

Total 93 98 98 289

A.) two-tailed, X-sqauared= 0.000, df= 7

B.) two-tailed, x-squared=35.8, df=6

C.) one-tailed, x-squared= 3.6, df=1

D.) two-tailed, X-squared=289, df=11