An insecticide company exposes 10,000 cockroaches to its newest product, as well as exposes another 10,000 to their previous formula. The researchers employ videotape to count how many cockroaches are still alive, and how many appear to be in distress, at ten second intervals. When the test is completed, the researchers find out the mean elapsed time before a cockroach was killed by each product.

I. Find out the population?

II. Find out the sample?

III. Is the study observational or experimental? Justify your answer.

IV. Determine the variables?

V. For each of those variables, what level of measurement (nominal, ordinal, interval, or ratio) was used to obtain data from these variables?