If n = 10 observations are randomly sampled from a distribution with mean µ = 9 and variance σ 2 = 8, what is the mean and variance of the sample mean?
2. Suppose you randomly sample n = 12 observations from a discrete distribution with the following probability function.
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X:
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1
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2
|
3
|
4
|
|
P(x):
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.2
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.1
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.5
|
.2
|
Determine E(X‾) and σ2x.