Science Buddies: "Ask an Expert"

Hello I'm Anna and I'm currently needing help .
Heres is my question I'm investigating. 'testing effectiveness of isotonic beverages on increasing/decreasing someones performance through push-ups' . But the issue is the independent and dependent variables must be quantitative- does anyone have any ideas what they could be? I do not mind if u have to make a modification to the question as long as both variables are quantitative and please outline a procedure as well.
And basically what i'm doing is giving people a certain ml of different isotonic drinks, and recording their results after they drink and do push-ups.
What graph do you think is appropriate and some controlled variables? The controlled variables I have right now are like variables like diet and etc.Also what do you think the qualitative and quantitative observations of this experiment is going to be?

Please help a year 9 girl out! It would be very much appreciated

Moderator note: Hi Anna, Please do not post your question to more than one forum, and please do not post a reply to your own post - if you post a reply, then the experts will most likely ignore your post since they will think that another expert has already replied to your question. Thank you and please be patient and an expert will help you soon.

Hello Anna,
You ask several questions, I will try to address each of them:

First, a question for you: since this is your experiment, you get to decide what you want to measure for performance.

If you have not decided, perhaps this section on "independent and dependent variables" in the Science Buddies Project Guidelines will help you:

https://www.sciencebuddies.org/science- ... /variables

That section also explains about "control" variables.

Also, looking at the examples might help you understand the difference between quantitative and qualitative variables:

https://www.sciencebuddies.org/science- ... s#examples

Again, since this is your experiment, it is up to you to select what variables to observe, so you can choose to observe just quantitative variables and you also decide which variables to use as control variables.

After you have read through those sections, please let us know if that helps and if you have more questions. If/When you do reply, please post a reply to this thread so the experts here at Science Buddies can keep track of your follow-up questions. Thanks!

BTW, here's an article about isotonic beverages which might be of interest!

https://www.eurekalert.org/pub_releases ... 013114.php