What is a Control Group? 1. A group that changes the varaiblle.
2.The group that applies the variable
3.The group that test s the varaible
4.A test group where the varaible is not changed or applied.

Which one?

4. A test group where the variable is not changed or applied

Explanation:

4. A test group where the variable is not changed or applied

Explanation:

f high

explanation:

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.