In each question identify the population and the sample then describe the sampling method that was used.

A machinery manufacturer purchases voltage regulators from 10 different suppliers. There are reports that variation in the output voltage of the regulators is affecting the performance of the finished products. To assess the quality of the suppliers' production, the manufacturer sends a random sample of 5 regulators from each of his suppliers' last shipments to a lab for study.

Based on the question given,

The Population is all the voltage regulators produced by the 10 suppliers.

The Sample is 5 regulators from each of 10 suppliers' last shipments.

The sampling method used is the stratified random sampling (since each supplier is a stratum).

Step-by-step explanation:

Based on the question given,

The Population is all the voltage regulators produced by the 10 suppliers.

The Sample is 5 regulators from each of 10 suppliers' last shipments.

The sampling method used is the stratified random sampling (since each supplier is a stratum).

A method of sampling that requires the division of a population into smaller groups known as strata is known as the Stratified random sampling. In this sampling method, the strata are formed based on the attributes or characteristics shared by the members.