Hoping to encourage more shoppers to come downtown, a city builds a new public parking garage in the central business district. The city plans to pay for the structure through parking fees. For a random sample of 60 weekdays, the sample average was $373 with sample standard deviation of $89 per day. What function would you use to calculate a confidence interval? O ZInterval because we are estimating the population mean and we do not know the population standard deviation. O TInterval because we are estimating the population mean and we do not know the population standard deviation. O ZInterval because we want to estimate the population mean and we know the population standard deviation. O TInterval because we want to estimate the population mean and we know the population standard deviation. QUESTION 2 Hoping to encourage more shoppers to come downtown, a city builds a new public parking garage in the central business district. The city plans to pay for the structure through parking fees. For a random sample of 60 weekdays, the sample average was $373 with sample standard deviation of $89 per day. Calculate and interpret the 80% confidence interval for the population mean parking fee. O (358.11, 387.89) We are 80% confident that the sample mean parking fee for 60 days is between $358 11 and $387.89. O (358.28, 387.72) We are 80% confident that the sample mean parking fee for 60 days is between $358.28 and $387.72. (358.11, 387.89) We are 80% confident that the population mean parking fee is between $358.11 and $387.89. (358.28, 387.72) We are 80% confident that the population mean parking fee is between $358.28 and $387.72