A firm which bottles shampoo selects some filled bottles for examination: The procedure used is that two random numbers are chosen, x and y. Starting at the x bottle filled, every bottle at an interval of y is then chosen for examination. This type of sampling is known as:

A. The central limit theorem B. The law of statistical regularly C. The law of inertia of large numbers D. None of the above

A. Sampling error B. Measurement error C. Coverage error D. Non-response error

A. Both (A) and (R) are true B. (A) is true, but (R) is false C. (A) is false, but (R) is true D. Both (A) and (R) are false

A. 0 B. 1 C. 0.4 D. 0.8