Consider a sample with data values of 19, 20, 5 ,8 , and 18 .
Compute the variance.
(to 1 decimal)
Compute the standard deviation.
(to 2 decimals)
Solution :
n = 5
= = (19 + 20 + 5 + 8+18) / 5 = 70 / 5 = 14
s2 = (x - )2 / n - 1
= (19 - 14)2 + (20 - 14)2 + (5 - 14)2 + (8 - 14)2 + (18 - 14)2 / 5 - 1
= 194 / 4
= 48.5
variance = 48.5
standard deviation = variance = 48.5 = 6.96
Consider a sample with data values of 19, 20, 5 ,8 , and 18 . Compute...
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