Question

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 descriptive experimental investigative

Explanation:

• Comparative investigation: Compares different things (bottled water vs tap water here).
• Descriptive investigation: Just describes a single thing, not comparing.
• Experimental investigation: Usually has a variable being manipulated in a more controlled setup (not just comparing existing samples).
• Investigative is too broad and not a standard specific type like the others. Since Sally is comparing bottled water and tap water, comparative is the right fit.

Answer:

comparative