Question: Part b) (6 marks) A random sample of 4 observations was drawn from a normal population. The sample same and standard deviation are =200 and

Part b) (6 marks) A random sample of 4 observations was drawn from a normal population. The sample same and standard deviation are =200 and =40. i) Estimate the population mean with 90% confidence. ii) Repeat part i) assuming the population standard deviation =30.

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