A lighting company seeks to study the percentages of defective glass shells being manufactured.

A lighting company seeks to study the percentages of defective glass shells being manufactured. Theoretically, the percentages of defectives are dependent on temperature, humidity, and the level of artisan expertise. Complete historical data are available for the following variables on a daily basis for a year: a. Temperature ( high, normal, low) b. Humidity (high, normal, low) c. Artisan expertise level ( expert, average, mediocre) Some experts feel that defective also depend on productionsupervisors. However, data on supervisors in charge areavailable for only 242 of the 365 days. How should thisstudy be conducted?

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