Walters created a list of all sales invoices to verify that they were supported by the appropriate shipping documents. Invoice number 15 was selected first for examination, followed by the invoices numbered 30, 45, 60, 75, 90, and so on until 40 invoices had been selected.
A)unrestricted random (UR)
B)systematic random (SR)
C)haphazard (H)
D)block (B)

Question

Quizplus · Accepted Answer

The selection of every 15th invoice (15, 30, 45, etc.) indicates a systematic random sampling method, where a fixed interval is used to select samples from a list.

Walters Created a List of All Sales Invoices to Verify