Hoping to attract more shoppers, a city builds a n...

Hoping to attract more shoppers, a city builds a new public parking garage downtown. The city plans to pay for the structure through parking fees. The consultant, who advised the city on this project, randomly selected 44 weekdays. Daily fees collected averaged $126. Based on data from other parking structures, the consultant will assume parking fees at this parking garage are Normally distributed with a standard deviation of $15.
(a) What is a 95% confidence interval for the true mean daily income this parking garage will generate from the parking fees?
(b) What is a 90% confidence interval for the true mean daily income this parking garage will generate from the parking fees?
(c) What is a 74% confidence interval for the true mean daily income this parking garage will generate from the parking fees?
(d) Provide a proper interpretation of the confidence interval you found in (c)?


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