1. Describe the two components of a random sample.
2. If n = 10 observations are randomly sampled from a distribution with mean µ = 9 and variance σ2 = 8, what is the mean and variance of the sample mean?
3. Determine E(X‾) and σx2 for a random sample of 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
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3
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4
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P(x):
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.2
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.1
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.5
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.2
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