Answer:the aswer is a
Explanation:
the explanation is in the book in page 148
Hiya! I don't know if you use Quizletm but it has helped me a lot! Here is a link to it about this question! :)
https://quizlet.com/17715268/chapter-27-flash-cards/
There are six common variable types:
DEPENDENT VARIABLES.
INDEPENDENT VARIABLES.
INTERVENING VARIABLES.
MODERATOR VARIABLES.
CONTROL VARIABLES.
EXTRANEOUS VARIABLES.
Here you go, sorry if this didn’t help
