Question

Is Standard Deviation and mean correct??

Week 2 – Statistics Exercise

1. The sum of the squared values of deviation scores = 4972.64
2. Variance = Sum of the squared values of deviation scores ÷ total number of scores
3. Therefore, variance = 198.905
4. Standard deviation = √Variance = 14.10

The formula for calculating z scores is as follows:

X	f	X−x	(X−x)2
78	1	5.88	34.57
67	2	5.12	26.21
69	2	3.12	9.73
63	1	9.12	83.17
85	1	12.88	165.89
72	1	0.12	0.01
92	1	19.88	395.21
67	2	5.12	26.21
94	1	21.88	478.73
69	2	3.12	9.73
61	1	11.12	123.65
96	1	23.88	570.25
73	1	0.88	0.77
79	1	6.88	47.33
62	1	10.12	102.41
61	2	11.12	123.65
44	1	28.12	790.73
66	1	6.12	37.45
87	1	14.88	221.41
76	1	3.88	15.05
83	1	10.88	118.37
42	1	30.12	907.21
82	1	9.88	97.61
84	1	11.88	141.13
51	1	21.12	446.05

   

Z=(5.88/14.10)

X-x = 5.88

S= 14.10

Answer 1