CHALLENGE ACTIVITY 6.2.1: Hypothesis test for a population mean. 361666. 1905872.qx3zqy7 V Jump to level 1 A rods manufacturer makes rods with a length that is supposed to be 18 2 inches. A quality control technician sampled 18 rods and found that the V sample mean length was 18.05 inches and the sample standard deviation was 3 0.2 inches. The technician claims that the mean rod length is less than 18 inches. 4 Select What type of hypothesis test should be performed? Ex: 0.123 What is the test statistic? Ex: 20 What is the number of degrees of freedom? Does sufficient evid Select Y t at the a = 0.01 significance level to support the technician's claim