A bottling company produces bottles that hold 12 ounces of
liquid. Recently, the company was receiving complaints that their
bottles are underfilled. To test this claim, the bottling company
randomly sampled 39 bottles and determined that the average amount
of liquid held by the bottles is 12.14 ounces with a sample
standard deviation of 1.5 ounce. Calculate the appropriate test
statistic. Round your answer to three decimal places.