Question

1. which of the following is not one of the four principles of experimental design?

○ replicate
○ randomize
○ stratify

Explanation:

The four principles of experimental design are control, randomize, replicate, and block (or sometimes considered with other formulations, but stratify is a sampling technique, not an experimental design principle. Replicate (repeating experiments), randomize (assigning treatments randomly), are part of experimental design. Stratify is used in sampling (like stratified sampling) to divide a population into subgroups, not in experimental design setup.

Answer:

C. stratify (assuming the options are labeled as A. replicate, B. randomize, C. stratify; if labels differ, adjust but the content is stratify as the non - experimental design principle among the given)