Estimate the population means with 99% confidence

Reference no: EM133360388

Part A)

The mean of a sample of 25 was calculated as mean of 250. The sample was randomly drawn from a population whose standard deviation is 20.
Question i) Estimate the population means with 99% confidence.
Question ii) Repeat part a changing the population standard deviation to 50

Part b)
A random sample of 4 observations was drawn from a normal population. The sample same and standard deviation are ??¯=200 and ??=40.
Question i) Estimate the population mean with 90% confidence.
Question ii) Repeat part i) assuming the population standard deviation σ=30.

Reference no: EM133360388

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