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A sample of 40 West-Highland Terriers yield a sample mean height at the withers of 10.3. Construct a 90% confidence interval for the population mean

A sample of 40 West-Highland Terriers yield a sample mean height at the withers of 10.3. Construct a 90% confidence interval for the population mean height at withers for Westies based on this sample. We know the height at the withers is normally distributed with a population standard deviation of 0.5. What is the upper limit of the confidence interval

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