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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 11 people of the mean people using public transportation. The standard deviation is 100. What is the sample size necessary for a 90% confidence level? O 223 O 224 14.95 O 15

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