You observe the following sample: {2.3, 4.7, 2.9, 4.0, 3.2, 7.8, 9.1, 3.2, 2.4}. Calculate the...
You observe the following sample: {2.3, 4.7, 2.9, 4.0, 3.2, 7.8, 9.1, 3.2, 2.4}. Calculate the sample mean and the sample variance.
Homework Answers
sample mean = Xi / n
= (2.3+ 4.7+ 2.9 + 4.0+ 3.2+ 7.8+ 9.1+ 3.2+ 2.4) / 9
= 39.6 / 9
= 4.4
Sample mean = 4.4
Sample variance = Xi2 - n
* (sample mean)2 / n-1
= (2.32+ 4.72+ 2.92 + 4.02+ 3.22+ 7.82+ 9.12+ 3.22+ 2.42) - 9 * 4.42 / 8
= 5.93
Sample variance = 5.93
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