Question

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question
a consumer research company is interested in determining if a certain companys new refrigerator model is more efficient than the older model. researchers decided to investigate the claim that the new model uses 10% less electricity than the older model for the same cooling load. which data collection method is appropriate? select only one answer choice.
select the correct answer below:
the company should obtain random samples of people who own each model and measure the electricity used over one month for each refrigerator.
the company should obtain random samples of each model, place them in similar conditions, fill them with the same number of water bottles, and monitor their electrical usage over one month.
the company should get a random sample of the new model, place them all in similar conditions, fill them with the same number of water bottles, and monitor their electrical usage over one month.
the company should obtain one new model and one old model, place them both in the same room, fill them with the same number of water bottles, and monitor their electrical usage over one month.

Explanation:

To test if the new refrigerator model uses 10% less electricity for the same cooling load, we need a controlled comparison that isolates the model as the only variable. Using random samples of both models, keeping conditions identical (same cooling load from equal water bottles, similar environments), and measuring usage eliminates confounding factors like user behavior or varying home conditions. Small single-sample or single-unit tests lack statistical reliability, and sampling existing owners introduces uncontrollable variables.

Answer:

The company should obtain random samples of each model, place them in similar conditions, fill them with the same number of water bottles, and monitor their electrical usage over one month.