Question

1. The following are data on final score in a class and a rating of the student’s enjoyment of the class on a scale from (1 = hated it to 10 = best class ever).

   Final Score	Rating
   68	2
   79	4
   80	3
   82	5
   82	6
   85	4
   87	7
   87	7
   87	8
   90	6
   95	9
   97	7

   Calculate the standard deviation of the final score.

   		8.60
   		5.47
   		7.68
   		9.12

2. Calculate the standard deviation of rating.

   		2.10
   		3.14
   		2.68
   		1.45

Answer 1

Observation Table:

Final Score (X)	(X-Xbar)2	Rating (Y)	(Y-Ybar)2
68	286.2864	2	13.4689
79	35.0464	4	2.7889
80	24.2064	3	7.1289
82	8.5264	5	0.4489
82	8.5264	6	0.1089
85	0.0064	4	2.7889
87	4.3264	7	1.7689
87	4.3264	7	1.7689
87	4.3264	8	5.4289
90	25.8064	6	0.1089
95	101.6064	9	11.0889
97	145.9264	7	1.7689
1019	648.9168	68	48.6668

Standard deviation for final score:

Standard deviation for rating: