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Answer to Question #76846 in Statistics and Probability for Bradley Neiers
Question #76846
A population has a mean of 220 and a standard deviation of 80. Suppose a sample of size 100 is selected and x ̅ is used to estimate μ.
What is the expected value of x ̅ ?
What is the standard deviation of x ̅?
What is the probability that the sample mean will be within ± 5 of the population mean?
What is the probability that the sample mean will be within ± 10 of the population mean?
What is the expected value of x ̅ ?
What is the standard deviation of x ̅?
What is the probability that the sample mean will be within ± 5 of the population mean?
What is the probability that the sample mean will be within ± 10 of the population mean?
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