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3 Question 2 (1 point) If the problem below is given: Suppose that a garage samples 20 customers. They find the average time for their

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3 Question 2 (1 point) If the problem below is given: Suppose that a garage samples 20 customers. They find the average time for their oil change is 4521 miles. Find a 90% confidence interval of the true mean, if the sample standard deviation is 1234. What is the formula to be used? O al x - Za/2 .

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