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Can someone please help with this question for stat? 24. The director of the IRS has been flooded with complaints that people must wait more

Can someone please help with this question for stat?

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24. The director of the IRS has been flooded with complaints that people must wait more than minutes before seeing an IRS representative. To determine the validity of these complain the IRS randomly selects 400 people entering IRS offices across the country and records ,' times that they must wait before seeing an IRS representative. The average waiting time fo the sample is 55 minutes with a standard deviation of 15 minutes. a. What is the population being studied? b. Are the complaints substantiated by the data at a = 0.10

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