at a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver 750 milliliters of water. the technician dispenses 38 samples of water and determines the volume of each sample. the 38 samples have a sample mean volume of 751.1 ml. the machine is out of calibration if the mean volume differs from 750 ml. the technician wants to perform a hypothesis test to determine whether the machine is out of calibration. the population standard deviation of the dispensed volume is known to be 5.1. compute the value of the test statistic.