As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the parking tickets issued by city parking officers to determine the number of tickets per officer that were improperly issued. Because there has recently been a change in the parking department's hiring practices, the Mayor suspects that the mean number of improperly issued tickets has changed. In past years, the number of improperly issued tickets per officer had a Normal distribution with a mean (mu) of 380, and std dev (sigma) of 35.2. You conduct a hypothesis test at the 90% level to test the null hypothesis that the mean number of improperly issued tickets is different than 380. Your audit of 50 randomly selected parking officers yields an average of 390 tickets. What are the critical values for this hypothesis test?
As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the parking tickets issued by city parking officers to determine the number of tickets per officer that were improperly issued. Because there has recently been a change in the parking department's hiring practices, the Mayor suspects that the mean number of improperly issued tickets has changed.
In past years, the number of improperly issued tickets per officer had a
You conduct a hypothesis test at the 90% level to test the null hypothesis that the mean number of improperly issued tickets is different than 380. Your audit of 50 randomly selected parking officers yields an average of 390 tickets.
What are the critical values for this hypothesis test?
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