On discovering an improperly adjusted drill press,Jack Joyner,Director of Quality Control,ordered an inspection of every fifth casting drilled during the evening shift.Less than 1% of the castings were defective; so,Jack released the evening shift's production to assembly. This is an example of _______________.
A) nonparametric statistics
B) nominal data
C) descriptive statistics
D) inferential statistics
E) judgmental statistics

Question

Quizplus · Accepted Answer

This is an example of inferential statistics because Jack is using a sample (every fifth casting drilled during the evening shift) to make inferences about the entire population (all castings drilled during the evening shift). Additionally, he is making a decision based on the characteristics of the sample (less than 1% defective) and applying it to the entire production (releasing it to assembly).

On Discovering an Improperly Adjusted Drill Press,Jack Joyner,Director of Quality