A city wants to know the amount of recycling collected on an average day. They know from previous experience that

A city wants to know the amount of recycling collected on an average day. They know from previous experience that the standard deviation is 1.5. City officials take a random sample of 26 days and calculate a sample mean of 4.1 tons of recycling.
Estimate a 94% confidence interval for the estimated mean amount of collected recycling