You have calculated the following variance ratios after a repeatability and reproducibility study:

EV$\%$ of Total Variance $=17\mathrm{.}50\%$

AV$\%$ of Total Variance $=74\mathrm{.}32\%$

PV$\%$ of Total Variance $=8\mathrm{.}18\%$

Based on these numbers, what should be your area of focus for quality improvement?

Parts

Equipment

Equipment and Parts

Appraisal $($operator$)$