Health Insurance Statistics Uninsured
Variance ?
I had a question from my Statistics AP homework and I was wondering if you guys could help me.
Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid and have no private health insurance. The ages of 25 uninsured senior citizens were as follows:
60 61 62 63 64 65 66 68 68 69 70 73 73
74 75 76 76 81 81 82 86 87 89 90 92
Calculate the variance of the ages of the uninsured senior citizens correct to the nearest hundredth of a year squared.
A. 86 years2
B. 90 years2
C. 95 years2
D. 98 years2
I know that variance is calculated by subtracting the data from the mean then squaring and then finding the mean, but each time I do that I always get 121 years2. Am I doing something wrong?
I get 94 years2 as follows:
60197.12
61170.04
62144.96
63121.88
64100.80
6581.72
6664.64
6836.48
6836.48
6925.40
7016.32
731.08
731.08
740.00
750.92
763.84
763.84
8148.44
8148.44
8263.36
86143.04
87167.96
89223.80
90254.72
92322.56
74.04=Average94.96=Variance
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April 16 2010 02:22 am | health insurance