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A study of a local city is being conducted to find out the average number of people that use public transportation every day. The sample

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A study of a local city is being conducted to find out the average number of people that use public transportation every day. The sample mean should be within 8 people of the mean people using public transportation. The standard deviation is 80. What is the sample size necessary for a 90% confidence level? O 17 O 16.45 O 271 O 270

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