Small Sample Mean Problem. The maker of potato chips uses an automated packaging machine to pack its 20-ounce bag of chips. At the end of a shift 15 bags are selected at random and tested to see if the equipment needs to be readjusted. After one shift, a sample of 15 bags yielded the following data. mean = 19.45 s = .64 n = 15. A 90% confidence interval would have what as the Bound of Error? .165*1.761 .398 19.159 to 19.741 1.761
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However, we are not given the sample standard deviation, so we need to estimate it using the sample mean and range. The range is the difference between the largest and smallest values in the sample. We are not given the range, but we can estimate it using the Show more…
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