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In a random sample of 40 people who work in Vancouver, the average commute time by car is 30 minutes with a standard deviation of

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In a random sample of 40 people who work in Vancouver, the average commute time by car is 30 minutes with a standard deviation of 4 minutes. Assume that the distribution is approximately Normal. What minimum sample size is needed for the margin of error of a 99% confidence interval to be at most 1 minute? Answer as a whole number. Use Excel to get precise values

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