Box-and-whisker Plot

[luke75912345]

what program is this that khan is using? did he create it or did he download it?

[luke75912345]

Only video on youtube I have ever seen that has no dislikes xD

this is one great video

[blinkfunny]

thank you so much you just saved my grade :)

[NeftaliPR]

The formula for the 25th (Q1) and 75th (Q3) percentiles are (n+2)/4 and (3n+2)/4, respectively. The only reason he uses (9+1)/2, for Q1, instead of (17+2)/4 (which follows the previous formulas) is because he decided to use the center point as his end point for Q1 and starting point for Q3. This gets complicated when you have an even number of data points and your center point is an average of two points, hence the more accepted above formula.

[NeftaliPR]

@JoAnn4729 and @MrOttomatic123

He does the 17+1 because that's the general formula for finding Q(1-3). For the median (Q2) the formula is esentially (n+1)/2 where n is your number of data points. As he mentioned, if there were an even number of data points you would take the mean, or the average, of the two center points. This is a very simple example, which is why it seems silly that he didn't just cross numbers of each side until he reached the middle, or alternatively, multiplied n*0.50.

[MissPacGirl]

What happens when your median is a decimal? 

[TwoTekah]

@MissPacGirl then your median is a decimal. It doesnt matter.

[MrOttomatic123]

all u had to do was cross one off of each side until u reach center i got confused with the 17+1 thing

[XAppleblitzX]

Thank u

[JoAnn4729]

Why 17+1 to find the median? I understand the divided by 2 etc. but why the 1 added?

[Forehead2Brick]

Remember to always include the median when making box-and-whisker plots. This video was misleading because Khan suggests you can sometimes not include it, but that's false.

[jbro827]

You do not include the median when finding Q1 and Q3. You must leave the median out of it. It just so happened that these numbers worked with using the median, which is misleading.

[speedninja2000]

Thanx I had trouble in class today

[themomo6710]

5:18 shouldn't it be (8+1)/2???????????

[jonjonjon1370]

@themomo6710 i guess u include the actual median too? i dunno, good question though

[themomo6710]

@jonjonjon1370 you don't!

[Karim1scorpion]

Man i never comment to Youtube videos...but i had to do so here

THAANNKKK YOUUUU !!!!!!!!!!

[themomo6710]

@Karim1scorpion Maybe because you can;t speak English!

[j3r3mysk8]

thanks so much(: I hove trouble paying attention in class so this was really helpful! (lol, most of the time i just choose not to)

[amandapanda2860]

cool



[paperscissorsr0ck]

@animatorization, it's 34.5 :) because that is in between 34 and 35

[AriaHale]

Thanks man(:

[49ersman21]

This really helped on my hmwrk. Thx

[TNTGIRL1ST]

Thanks Helped Me Alot !

[jgkcruz]

This is the third video I watch with this professor. I WISH HE WAS MY TEACHER!!!

[BESTDECIMATORMODZZ]

praise Allah, from Osama in kuwait

[Darkwood5555]

Oh my god you saved my algebra grade. . . thankyou <3

[mynewlife27]

i understood this so much better than how my teacher explains it!

[animatorization]

what if you're trying to find the 1st quartile and it's a even number like between 34,35 which number is the 1st quartile?

[kevinelmore1]

THANK YOU

[omabdulaziz100]

May allah blessing you

Ana from saudi Arabia

[cjdaninja]

Thank you kahn. You da bomb

[brandonbeckster]

Thank you very much you explained everything so perfect ..your the best Pre algebra teacher on Youtube..

[airoz15]

waaa thanx u!!~*

i really love your explanation

this was very helpful for me!! <3

[victordalia]

thanks this is very usful for my test

[MrJohm1]

Thanks

[yaasianspongebob]

Yes i know it now hahaha

[1006dude]

this helped alot

didnt get it in math class

now i do

lololol

[renj3000]

thanks

[pjanak]

So whats the middle number when both your numbers to the left and to right ar the number 10?

[pjanak]

COMMON? i NEVER SAY THESE when I was in scool in the 70's and 80's

This alo is a way not taught by most schools. Stick to the way that does not include adding 1 or including the middle number in finding the LQ

[shazaduh]

Very nice explanation. Thank You!!

[roidroid]

i really like this kindof plot style, nice and intuitive.

[alkalait]

also known as boxplot

[btkw]

at the beginning it sounds like the 'wheel of fortune' tv show lol

[ThePredorious]

@btkw Ahaha (SARCASM)

[karevkarev]

Hey, man, it's going to be 1400 videos soon! Keep up good work!

[vickiormindyb]

Whiskers remind me of my kitty. Hers are pretty and long.

I wish you would have been around when I worked w/ the guy who liked playing the market. He was always acting like he knew everything and we didn't He was so snooty about it. I'd have loved seeing someone put him in his place.

He NEVER used words like quartile. He was talking bs, we just couldn't prove it.

Other than his snooty tone, which he could and would have argued was our perception.

[hossein1413]

i studied this in the beginning of the year thx man ur the best

[biozamadotcom]

good

[zackboomer]

first