In a random sample of18 residents of the state of Montana, the mean waste recycled per person per day was2.1pounds with a standard deviation of0.74pounds. Determine the80%confidence interval for the mean waste recycled per person per day for the population of Montana. Assume the population is approximately normal.

Step 1 of 2:Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

Step 2 of 2:Construct the80% confidence interval. Round your answer to one decimal place.