Hospital floors are usually covered by bare tiles. Carpets would cut down on noi

Question

Hospital floors are usually covered by bare tiles. Carpets would cut down on noise but might be more likely to harbor germs. To study this possibility, investigators randomly assigned 8 of 16 available hospital rooms to have carpet installed. The others were left bare. Later, air from each room was pumped over a dish of agar (a gelatinous substance obtained from various kinds of red seaweed and used in biological culture media). The dish was incubated for a fixed period, and the number of bacteria colonies were counted.   The explanatory variable in this experiment is

Explanation / Answer

The explanatory variable in this experiment is

that is independent variable is 16 available hospital rooms to have carpet installed

Option A is correct

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