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For a normal distribution with a known standard deviation of = 8.8, you take a sample of 36 readings and find a sample average of

For a normal distribution with a known standard deviation of = 8.8, you take a sample of 36 readings and find a sample average of 115.5. Find the following: 2 marks

(a) A 90% confidence interval for the true mean

(b) A 99% confidence interval for the true mean

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