Of the Two Production Methods, a Company Wants to Identify

Multiple Choice

Of the two production methods, a company wants to identify the method with the smaller population mean completion time. One sample of workers is selected and each worker first uses one method and then uses the other method. The sampling procedure being used to collect completion time data is based on​

A) ​worker samples.
B) ​pooled samples.
C) ​independent samples.
D) ​matched samples.