Question

practice it!
sally is a chemist who read an article about how 40% of the bottled water that is sold in stores comes out of the faucet of the factory.
sally decides to test a couple of her favorite bottled water brands sold locally against the tap water in her home.
she decides to investigate in her lab to find out which bottled water has the same chemical ingredients as her tap water.
which of the following is the type of investigation sally should use to test her problem?
investigative
experimental
descriptive
comparative

Explanation:

Sally is comparing bottled water brands with her tap water to see which has the same chemical ingredients. A comparative investigation involves comparing different groups (here, different bottled water brands and tap water) to identify similarities or differences. Investigative is too broad, experimental would involve manipulating variables (she's not doing that), and descriptive is about describing a phenomenon (not her goal here).

Answer:

comparative