CHALLENGE ACTIVITY 6.2.1: Hypothesis test for a population mean. 366676.1997634.qx3zqy7 V Jump to level 1 - V A pipes manufacturer makes pipes with a length that is supposed to be 13 2 inches. A quality control technician sampled 11 pipes and found that the sample mean length was 13.08 inches and the sample standard deviation was 3 0.22 inches. The technician claims that the mean pipe length is not 13 inches. 4 What type of hypothesis test should be performed? Two-tailed z-test v Select What is the test statistic? Ex: 0.123 Right-tailed t-test What is the number of degrees of freedom? Ex: 20 Two-tailed z-test Left-tailed t-test Does sufficient evidence exist at the a = 0.01 sign port the technician's claim? Select v Two-tailed t-test 2 3 Check Next