A quality control inspector of flow metering devices wants to perform a hypothesis test to determine whether the mean flow rate is different from the flow rate setting of 150 (ml/h).

random sample of 15 devices is tested and the sample mean ow rate is found to be E = 144.5 (ml/h), and the sample standard deviation of the ow rate is found to be 3 : 7.8 (ml/h). l. Formulate and test the appropriate null H0 and alternative hypotheses H1 to verify the inspector's claim at level a = 0.1. Is there evidence to support the claim? (Justify your answer.) 2. Based on the P-value, can you reject H0 at level a = 0.01? (Justify your answer.)