The city wishes to estimate the average commute distance for all city employees. They collect a random sample of 93 employees and find a sample mean of a = 6.8 miles. They also assume a population standard deviation of = 1.7 miles. Calculate the z interval to estimate, , the average commute distance for all city employees with 95% confidence. Check the conditions for performing a one-sample t-interval. The sample is a random sample and representative of the population The sample size is sufficiently large so the sampling distribution should be approximately normal The population distribution is approximately normal so the sample size does not matter The sample size not sufficiently large so the sampling distribution can't be assumed approximately normal