Question

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

Answer 1

Jack Joyner's method of inspecting every fifth casting to decide the production quality is an example of inferential statistics, where a sample is used to estimate a population parameter.

Step-by-step explanation:

Jack Joyner's approach of inspecting every fifth casting during the evening shift and basing his decision on less than 1% of those being defective is an example of inferential statistics. This facet of statistics involves estimating a population parameter from a sample statistic. In this case, Jack used a sample to estimate the quality of the entire shift’s production and make a decision about whether it met acceptable standards.