Problem 4 Description: Two different Types of injection-mold…
Problem 4 Description: Two different Types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 100, are selected, and 12 defective parts are found in the sample from machine 1 while 5 defective parts are found in the sample from machine 2. Is it reasonable to conclude at 0.04 level of significance that machine 1 produces higher higher fraction of defective parts than machine 2? Use Excel to do all the computations. Answer all the questions below and upload your Excel file to the last question and submit.
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