The data for this problem is the thickness of paint can "ears". Periodically, a sample of five ears is selected from a bin and the thickness recorded. It was discovered that the bin containing paint can ears was produced by two different machines. In light of this information and the plots, suggest a more appropriate way to analyze this data.

Choose what you believe is the best answer from the following answers:

Group of answer choices

i) Separate the data by the machine that produced the paint can ear and plot a separate histogram for each machine.

ii) Conduct a second level Pareto analysis of this data based on the defects for each of the two machines.

iii) Since there was a special cause in the X-Bar chart, eliminate that data and replot the histogram.

iv) Both i) and iii) are correct.