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Category > Management Posted 08 Jan 2018 My Price 7.00

population mean

18.      A population has a mean of 200 and a standard deviation of 50. A simple random sample of size 100 will be taken and the sample mean x¯ will be used to estimate the population mean.

a.       What is the expected value of x¯?

b.       What is the standard deviation of x¯?

c.       Show the sampling distribution of x¯.

d.       What does the sampling distribution of x¯ show?

19.      A population has a mean of 200 and a standard deviation of 50. Suppose a simple random sample of size 100 is selected and x¯ is used to estimate μ.

a.       What is the probability that the sample mean will be within ±5 of the population mean?

b.       What is the probability that the sample mean will be within ±10 of the population mean?

 

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Maurice Tutor
(5)
Status NEW Posted 08 Jan 2018 09:01 PM My Price 7.00

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