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?
comparative
investigative
descriptive
experimental

Explanation:

Sally is comparing the chemical ingredients of different bottled water brands with her tap water. A comparative investigation involves comparing different groups or items to identify similarities or differences. An investigative investigation is too broad, a descriptive one focuses on describing a phenomenon, and an experimental one involves manipulating variables (which isn't done here as she's just comparing existing samples). So the correct type is comparative.

Answer:

comparative