A quality control technician is monitoring the performance of a computerized filling machine used to fill intermediate bulk containers (IBCS) with a cleaning solution. The machine, designated as FlowMate 1, is designed to fill containers with 1000 liters of solution. The filling amounts are normally distributed, with a standard deviation of 4 liters. The technician takes a random sample of 20 containers and calculates the sample mean to be 998.4 liters per bottle. Is this a one or two tailed test? Give me H0 and H1.