A sample of size n = 50 is drawn from a normal population whose standard deviation is ? = 9.3. The sample mean is ?x = 49.04. Part 1 of 2 (a) Construct a 90% confidence interval for ?. Round the answer to at least two decimal places. A 90% confidence interval for the mean is < ? < .
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Since we want to construct a 90% confidence interval, we need to find the critical value that corresponds to a 90% confidence level. The critical value can be found using a standard normal distribution table or a calculator. For a 90% confidence level, the Show moreā¦
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