Variables in Science: Independent, Dependent and Controlled!

This video explains independent, dependent, and controlled variables, with a special emphasis on controlling variables in experimental design. Helpful in understanding the scientific method!
What are variables? Is science, variables are all the things that can vary or change in an experiment.
To see how variables work, let’s set up an imaginary experiment testing the effect of vitamins on squid lifespan. Here are two groups of squid. One will receive vitamins and the other will not.
In this experiment (and every other experiment), there are 3 types of variables:
1. The Independent Variable: This is the variable that you manipulate, the thing that you are investigating. So, in an experiment testing how vitamins affect squid lifespan, the amount of vitamins given to your squid is the independent variable. As the experimenter, you decide to change this variable. It does NOT depend on any other variables in the experiment, which is why it is called the independent variable. Good experiments only have 1 independent variable!
2. The Dependent Variable: This is the variable that you are measuring. Think of this as your results. In our experiment, the dependent variable would be squid lifespan, because lifespan depends on what you changed in your experiment.
3. Controlled variables: These variables are all the things that you keep constant in your experiment. So, in our squid experiment, you would need to have many controlled variables. In fact, any variable that could affect your results (besides your independent variable) should be controlled. Temperature, food type, and water quality are all examples of controlled variables in this experiment and should be kept the same for both groups of squid.
Controlled variables are super important! If you fail to control your variables, your experimental results will be meaningless. Let’s see why.
Imagine that you don’t control these variables. The control group squid are kept in a tank with a temperature of 20oC and are given normal squid food and clean water (but no vitamins). But our experimental group is kept in a tank with a temperature of 90oC and fed nacho cheese while swimming in dirty water. We also give them vitamins.
Now, let’s say all our experimental group squid die after 2 hours. Does this mean that vitamins kill squid?
There is no way to know the effect of vitamins because we did not control our controlled variables! The squid could have died from being nearly boiled, or from nacho cheese, or from the dirty water! Because we did NOT control these variables, we CANNOT answer our question about the effect of vitamins on squid.
On the other hand, if we control our variables and make sure both groups get the same temperature, the same food, and the same water quality, and ONLY change the amount of vitamins (our INDEPENDENT VARIABLE), we will be able to answer our question.
So, remember! In an experiment, only change 1 variable (your independent variable), make sure you keep all other variables controlled, and then you will be able to measure your dependent variable or results.
Credits:
Music: www.bensound.com
Nachos picture from here: commons.wikimedia.org/wiki/Fi...
Vitamin Picture: commons.wikimedia.org/wiki/Fi...

[@mustarddiver7281]

everybody looking at the comments to see also who came here because of class

[@scrataaza]

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[@windagar1552]

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[@sweetnothing1045]

Lol yes

[@radhikadeshmukh5922]

Yep

[@gamecity4408]

So true

[@scrataaza]

so simple but so explanatory. I love this!

[@BioManBiology]

I'm glad you liked it! Thanks!

[@BioManBiology]

I'm happy to hear it helped!

[@danieldiditagainclipz4557]

no problem (;

[@efelicityp4543]

ok, I watched this on my science class.. and *What happened to the squid?*

[@bestbuilder7833]

squids do not necessarily need vitamins

[@rhenkhyleandreigorospe6690]

God boiled to death

[@rhenkhyleandreigorospe6690]

*Got*

[@arimarie9408]

Yo who else is here because of class lol
also good video

[@danieldiditagainclipz4557]

ye

[@BioManBiology]

Thanks!

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Tbh we are all here for class 😂✌🏼🥲

[@YazzenMedia]

I have a huge science test that’s 70% of my grade and you helped me thank you

[@YazzenMedia]

Much appreciate

[@BioManBiology]

I'm glad it was helpful! Hood luck on your test!

[@justjax7126]

I did not understand this in my class.I will watch this now.Thanks

[@ChocoKitEmojiCat]

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[@BioManBiology]

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[@BioManBiology]

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[@nivmittal-AddictionCounsellor]

Thank you so much for the explanation!! Very Clear and easy to understand.. 😍

[@BioManBiology]

You're welcome! I'm glad it was helpful!

[@user-uj2jv1qj9r]

Thanks for the great video i learnt a lot about squid killing

[@BioManBiology]

Thanks, and hopefully you also learned about variables 😉

[@sodapunk3241]

Helpful for class, thx😁

[@BioManBiology]

Great to hear! Thanks for letting me know!

[@ms_stealyourgoldfish]

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[@whoisnattttt]

omg i can not thank you enough!!! i used to find them so confusing but they are so clear now! thank you😊😊

[@BioManBiology]

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[@BioManBiology]

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ok DUDE THANK YOUUU honestly and i lean HONESTLY ive been killing myself trying to understand variables and this helped me SO MUCHHH like at first i was like "
ok Ok i get it... i dont get it." but now im like "ok i get it" HONESTLY THANK YOU!!! 👏👏👏👏

[@BioManBiology]

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Thanks I've trying to understand this since 7th year and now I get it because of you

[@BioManBiology]

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[@BioManBiology]

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[@BioManBiology]

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[@BioManBiology]

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why we gotta learn this in advanced 8th grade?

[@sazxnni_shii]

My teacher played this on the smartboard 2 years ago 😭 And when it comes to variables, I ALWAYSSS forget and have to be reminded again-
This is the onlyy video I’d watch if I have to be reminded about variables. Idc how long it takes me to hunt for this vid 💀
And today I spent like 10 mins trying to find this video until I searched up:
‘Whats the difference between independant and dependant variables octopus demonstration’ ☠️☠️☠️

[@BioManBiology]

I'm glad it is helpful to you!

[@mayahartup8906]

I am in year 9 and still didn't understand this until now! Thank you!

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Thx they put this in my class but smh I need to rewatch lol

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Thanks! The channel is pretty new, so I imagine it will take some time. Please feel free to subscribe if you enjoy the videos. Thanks!

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[@eena8970]

Thank you soo much I have a science test about the types of variables and I was sooo confused. I asked all my friends but none of them understood as well. So I started searching and a bunch of the vids were useless until I came across this vid I can't thank you enough! Now I have a great understanding of variables and I can even explain to my friends and brag!

[@BioManBiology]

I'm glad it was helpful! Thanks for letting me know!

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[@roccoarreola1727]

THIS IS AMAZING THANKS SO MUCH

[@BioManBiology]

Thanks, I'm glad you enjoyed it!

[@mrpenguin2279]

Good video! Helped me and gave me a better understanding about all 3 variables! But why do all "Good experiments only have 1 variable"?

[@BioManBiology]

Thanks! You should just have 1 Independent Variable so you can see how it affects your results. If you have more than one independent variable you won't be able to tell which one affected the outcome.

[@lennardspijker3835]

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[@BioManBiology]

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[@BioManBiology]

I hope that your test went well!

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why has my physics teacher forced me to watch this:D

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bruh moment

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Thanks

[@BioManBiology]

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Helped more than school thx

[@dani_davila]

Also this vid has so many views like that’s more people that even take science class in my school total

[@BioManBiology]

Glad it helped! Thanks!

[@Trump-ok7dc]

facks

[@swmicro]

2:25 after 2 hours at temperature 90C??? Don't forget to add solt and peper to make your squid soup tasty

[@BioManBiology]

Yeah, the conditions are intentionally absurd to illustrate the importance of controlling variables...😉

[@nilcelizarraga1730]

Encuentro los vídeos que necesito pero en otros idiomas AAAAAAA

[@BioManBiology]

Tal vez un día yo podría traducir los videos al Español. Estoy pensando en hacerlo pero toma un rato y no tengo mucho tiempo.

[@arandomperson4187]

I am watching this so ik what they are in my test

[@amirzaripov5533]

im here for ze class

[@00KitKat]

So uhhh what happened to the squids? Did the vitamins help them?

[@jasonvoorheesv1nce904]

And the Constant Variable? I confuse the Constant and Dependent Variable a lot

[@BioManBiology]

In the video, constants are referred to as controlled variables. These are the variables that are kept the same (constant) between your control and experimental groups.
The dependent variable is what you are measuring as a result of your experiment. So, in an experiment testing the effect of fertilizer on plant growth, plant growth would be the dependent variable. Notice that plant growth depends on what you did in your experiment. I hope that helps!

[@TM4ST3R]

What is the exact song on this video?

[@BioManBiology]

Sorry, I don't recall right now, but you can find it on bensound.com.

[@Thatonedancerrr]

I have to do my sience fair project due tomorrow I helped me alot

[@BioManBiology]

Glad to hear it!

[@samantha7521]

Its all about the variables 😂❤

[@BioManBiology]

👍

[@aileensun4786]

My science teacher made us watch this B-)

[@Abdylreal]

Thank you i hope i dont fail this grade

[@BioManBiology]

You're welcome and good luck! I hope it goes well!

[@theapocalypse4357]

helpfull

[@BioManBiology]

Good to hear!

[@yehyaaaaaaaaa]

Wait so do vitamins kill squid yes or no?

[@BioManBiology]

No, the situation is hypothetical. The squid died because other variables weren't controlled

[@adrianplayz4409]

I was forced to do thus

[@sainuninan8925]

He explained it faster than my teacher 😂whole year😂

[@BioManBiology]

I'm glad it was helpful to you!

[@rowanbarnard1152]

why do the squid have to die? they did nothing wrong.

[@purvashah3333]

example bro, life sucks for a moment!

[@ShubhamUpreti-qo1ud]

Isn't number of squids a controlled variable?

[@BioManBiology]

Yes, that could be another controlled variable. There are many.

[@jessicaellington1451]

what happened to the squid tho?

[@BioManBiology]

What do you mean?

[@yehyaaaaaaaaa]

@@BioManBiologylike did it die or what

[@SussyMukbangs]

I did not understand 😢

[@Buttworms34]

I can't believe I had to mess up my perfect recommended of COD and anime memes with this mistake of a video

[@vanitakatyal8520]

This was realy helpful, but control variables are to be kept same for both groups. The quality of water and food, and the temperature should be the same for both groups, then, we can measure the lifespan of the squids! A small example similar to the squid one-
Affect of amount of vitamins on a cat's lifespan-
Independant variable: Amount of Vitamins
Dependant variable- Cat's Lifespan
Control Variable- Temperature, quality of food & water, and the exersize the cat gets.
Hypothesis- The cat that gets vitamins will have a longer lifespan than the cat that does NOT get vitamins.
Conclusion- The cat that gets vitamins will have a longer lifespan, as the controlled variable is the same for both cat's, but the cat that gets more vitamins will live longer because it is healthier.

[@marty4146]

yeeep

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who’s here cuz their teacher wanted them to 🙄

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Confusing

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here from ms calebresis class

[@BioManBiology]

👍

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Yep school did this to me

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if mateo sees this then pls reply

[@magiezerna4802]

uhhh

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I watched this while farting on squid 🥵🥵🥵

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C to an A

[@BioManBiology]

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hello

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