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.wikime...
Vitamin Picture: commons.wikime...

[@mustarddiver7281]

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

[@scrataaza]

same

[@windagar1552]

yep

[@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!

[@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*

[@BioManBiology]

I'm happy to hear it helped!

[@danieldiditagainclipz4557]

no problem (;

[@brianseppala8579]

I think this video is the best video ever.

[@BioManBiology]

Thanks!😄

[@amysantiagosbinder]

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

[@BioManBiology]

Great to hear! Thanks!

[@nethra20119]

so true

[@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!

[@SilasHarveyRobothamMawdsley]

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

[@BioManBiology]

Thanks, and hopefully you also learned about variables 😉

[@nathalysanchez4909]

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]

This helped a whole lot. Thank you so much! You deserve so much more subscribers. God loves you! Road to 2k subs and counting!

[@BioManBiology]

Thanks! Glad it was helpful! All the best to you!

[@ChocoKitEmojiCat]

@@BioManBiology aww thank YOU too!

[@YasmanyDueñas-b9b]

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

[@BioManBiology]

I'm happy to hear that it helped!

[@GlitchGBG]

Thanks! I cant believe you Explained all that in just 3 Minutes!! your a life savor!!!

[@BioManBiology]

Thanks, I'm glad it helped!

[@ahhhhhh5298]

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]

You're welcome! I'm glad it was helpful to you! Thanks for the kind feedback!

[@sodapunk3241]

Helpful for class, thx😁

[@BioManBiology]

Great to hear! Thanks for letting me know!

[@domatheghost_]

Ok this is really helpful for my 7th grade test. Thank you for this video!

[@BioManBiology]

You're welcome! I'm glad that it helped!

[@notoriousyolkhound4600]

thanks a lot, this helped me more than my actual science class lmao

[@BioManBiology]

Happy to hear that it helped!

[@arimarie9408]

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

[@danieldiditagainclipz4557]

ye

[@BioManBiology]

Thanks!

[@foodisgoodyum]

this was so easy to understand i have a test i did not understand but this changed everything good video keep it up

[@BioManBiology]

Thanks, I'm glad it was helpful to you!

[@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!

[@beluga1582]

Instantly hit the sub button and smashed the like button, Thanks!!!! You explain better than my teacher

[@BioManBiology]

Thanks! I'm glad you enjoyed it!

[@fashiontrendss6540]

It was so helpfull..for my class😊

[@BioManBiology]

That's great to hear! Thanks for letting me know!

[@fashiontrendss6540]

my pleasure😊

[@kaashvimittal9896]

Thank you. I understood really well.

[@BioManBiology]

You're welcome, I'm glad it helped!

[@HibsøLean]

I was searching for the exact video like this, thank you for helping!

[@BioManBiology]

Cool, I am glad it was helpful!

[@mayahartup8906]

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

[@BioManBiology]

I'm glad it helped! Thanks!

[@nowee_can_drawww921]

This was soo much helpful! Thanks a lot!

[@BioManBiology]

Thanks! I'm glad it was helpful!

[@ericphan8806]

this is gonna help me for my 2nd grade test thank you!!!!!

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[@Biggestback-1]

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

[@BioManBiology]

Glad it helped!

[@alexsimmons-mallia9017]

thanks! finished that science homework with this, very easy to understand

[@BioManBiology]

Glad to hear it! Thanks!

[@tocalife2991]

love this video definitely watch this if you need help and want to understand

[@BioManBiology]

Thanks, I'm glad it was helpful to you!

[@absence2300]

why we gotta learn this in advanced 8th grade?

[@cw8486]

perfect, thanks

[@BioManBiology]

Thanks!

[@markymarq-yn6ub]

This helped me a lot thank you so much, this is gonna help me get an A in science

[@BioManBiology]

I'm glad it was helpful!

[@zal5782]

This video just saved my grade

[@BioManBiology]

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[@alfamysteryred5372]

I'm really greatful so I will subscribe

[@BioManBiology]

Thanks! I'm glad it was helpful!

[@danieldiditagainclipz4557]

Why do u have 349 subs??? u deserve more. Especially because u have 13.6k views.

[@yourlocalbandchild5297]

The views are probably from school

[@BioManBiology]

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!

[@danieldiditagainclipz4557]

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[@DanielDidItAgainn]

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[@KritikRiteshJesrani]

Great Video, Buddy!

[@BioManBiology]

Thanks!

[@yordanosegebremeskel6921]

such a calm and catchy way of explaining. Thanks boss;0

[@BioManBiology]

Thanks, I'm glad you enjoyed it!

[@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!

[@eena8970]

@@BioManBiology i got 9/10 and the one mistake was an exception, i am still very happy abt the score!

[@blakeobrien3554]

This really helped thank you

[@BioManBiology]

Great to hear Blake! Thanks for the feedback!

[@biscuitbread2118]

Thanks! This really helped ✨

[@BioManBiology]

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[@eena8970]

the definitions are amazing

[@BioManBiology]

Thanks!

[@niccinoo6993]

Thank you!!

[@BioManBiology]

You're welcome!

[@helencrawford7265]

A very helpful video!! Thanks!

[@BioManBiology]

I'm glad it was helpful! Thanks!

[@bryannunez8064]

This is going to be so helpful for my quiz

[@chloetang9169]

It helps a lot thank you!!!

[@BioManBiology]

You're welcome! Thanks for your comment!

[@vxqris]

Thank you so much this helped a lot:)

[@BioManBiology]

You're welcome! Glad to hear it!

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This video is so satisfying

[@The_Christian_Swiftie]

Thank you for this!

[@BioManBiology]

You're welcome! I'm glad you enjoyed it!

[@ms_stealyourgoldfish]

This video helped a lot thanks!

[@roccoarreola1727]

THIS IS AMAZING THANKS SO MUCH

[@BioManBiology]

Thanks, I'm glad you enjoyed it!

[@qapagotold9294]

This was very helpfull

[@BioManBiology]

Great to hear! Thanks!

[@haroldwood1394]

Nice, clear explanation: thank you!

[@BioManBiology]

Thanks, I'm glad it was helpful!

[@fippex197]

thankyou i have a test tomorrow

[@BioManBiology]

I hope that your test went well!

[@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!

[@rowanbarnard1152]

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

[@purvashah3333]

example bro, life sucks for a moment!

[@jennyfarrell4090]

verry good 5/5

[@BioManBiology]

Thanks!

[@lennardspijker3835]

Omg my teacher made me watch this now my recommended is fin a be ruined

[@amanda7465]

Could you make the music louder? I could almost hear the video

[@funnylivingtv3084]

Thank you
I needed help from my homework

[@BioManBiology]

You're welcome!

[@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.

[@senseofpurpose777]

Well understood.

[@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.

[@dani_davila]

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...😉

[@Aidenlikesplayingroblox]

Very Nice Indeed Keep Up The Good Work :D

[@BioManBiology]

Thanks for your comment! I appreciate it!

[@arandomperson4187]

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

[@00KitKat]

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

[@NishikaPrasanna]

What if we gave both the tanks dirty water at 90 degrees temperature and fed both nachos?

[@Autumn-x6w]

real

[@trevorpascoe9674]

Your a legend 👏👏👏🏆🏆

[@BioManBiology]

😄 Thanks, I'm glad you enjoyed the video!

[@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.

[@chiken1_]

Thanks

[@BioManBiology]

You're welcome!

[@ItsThatDancerLex]

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

[@BioManBiology]

Glad to hear it!

[@bugatti.95]

bruh moment

[@ShubhamUpreti-qo1ud]

Isn't number of squids a controlled variable?

[@BioManBiology]

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

[@amirzaripov5533]

im here for ze class

[@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

[@SussyMukbangs]

I did not understand 😢

[@Repentedprotestant]

Thank you i hope i dont fail this grade

[@BioManBiology]

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

[@jessicaellington1451]

what happened to the squid tho?

[@BioManBiology]

What do you mean?

[@yehyaaaaaaaaa]

@@BioManBiologylike did it die or what

[@adrianplayz4409]

I was forced to do thus

[@samantha7521]

Its all about the variables 😂❤

[@BioManBiology]

👍

[@aileensun4786]

My science teacher made us watch this B-)

[@sainuninan8925]

He explained it faster than my teacher 😂whole year😂

[@BioManBiology]

I'm glad it was helpful to you!

[@hav431am]

who’s here cuz their teacher wanted them to 🙄

[@Thuliumm]

What is the exact song on this video?

[@BioManBiology]

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

[@theapocalypse4357]

helpfull

[@BioManBiology]

Good to hear!

[@potatoz5749]

Confusing

[@yourlocalbandchild5297]

Yep school did this to me

[@earliethomas796]

hi

[@BioManBiology]

Hi!

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hello

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hello

[@BioManBiology]

Good day to you!

[@Potatoflipz]

if mateo sees this then pls reply

[@magiezerna4802]

uhhh

[@Wishy-k3q]

Roses are red
Violets are blue
I came here for school
And you did too

[@garre70]

C to an A

[@BioManBiology]

Cool, that's great!

[@cada448]

here from ms calebresis class

[@BioManBiology]

👍

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yeeep

[@peanutbutterguy123]

if it was not for this guy i would of failed

[@BioManBiology]

I'm glad it was helpful!

[@greciasp]

whos here ms millers class 🤨