10.21 In industrial settings, alternativemethods often exist for measuring variables of interest. The data in (coded tomaintain confidentiality) represent measurements in-line that were collectedfrom an analyzer during the production process and from an analytical lab. (Data extracted from M.Leitnaker, “Comparing Measurement Processes: In-line Versus AnalyticalMeasurements,” Quality Engineering, 13, 2000–2001, pp. 293–298.)
a. Atthe 0.05 level of significance, is there evidence of a difference in the meanmeasurements in-line and from an analytical lab?
b. Whatassumption is necessary about the population distribution in order to performthis test?
