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b) Suppose the standard deviation for the error in the measured speeds equals 4.5 mph. At 95% confidence, what sample size should be taken

b) Suppose the standard deviation for the error in the measured speeds equals 4.5 mph. At 95% confidence, what sample size should be taken to ensure that the margin of error is no larger than 1.6 mph? The sample size should be (Round up to the nearest whole number.) W

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