How to Find Quartiles and Inter-Quartile Range from Raw Data

Quartile Interquartile range, semi-quartile range, outliers and data analysis from the box-and-whisker plots: • How to Find Quartiles ...
/ @mathematicstutor
Learn from Anil Kumar: [e-mail]
#Statistics_GCSE #MeasuresofDispersion #IQR #InterquartileRange #Quartiles #Outliers
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CORRECTION: IQR for Ex2 will be 7.5 - 3 = 4.5.
Thanks to my Subscriber for pointing that out.
Highly appreciated

[@gabrielnestrada6640]

Thanks for sharing, j
Just so you know. the IQR in the second example is 4.5 not 3.5. (7.5 - 3 )= 4.5
thank you.

[@kiranyeluru7392]

Wow Anil sir excellent details sir

[@niharikamiryalavk]

Nice explanation

[@rajendramisir3530]

Excellent explanation Anil ji! Inter-quartile range represents the central half of this ungrouped data set.

[@rebekah3483]

Great way of explaining this! Thanks!

[@Narsimha_thapa_official]

Very easily understandable 👌
Good teaching

[@SpuckyBMusic]

You just saved a soul here👏

[@mehedimithu374]

Thank you. That was very helpful.

[@keithedwards2841]

Well explained

[@devasree5766]

How can average of 3rd and 4th observation become 3.25th position? If it is 3.5th position, it is ok. The correct formula is
3rd value +0.25*(4th value- third value)? Please reply sir

[@meghasrisrimal4713]

Thank you 😊. It was really helpful ..

[@vic902]

thank u so much. My teacher could not teach this in an entire lesson.

[@ajieaugustine9458]

Wow really lovely this lessons has really taught me a lot

[@haifaghohal9553]

Thanks for this explanation

[@indiraanandjit1172]

Excellent... Anil you have made this so easy!

[@ghadah9756]

Thank you so much this is so helpful!

[@p.chandra2444]

A wonderful explanation, I have got a crystal clear idea about the quartile and quartile range. Though there is a simple mistake which is 7.5-3 = 4.5, it should not bother anyone.

[@johnpiol1911]

clearly understood and thanks you Sir.

[@ClickyKitsune]

14:39 if you are only looking for IQR.... cheers

[@MathematicsTutor]

CORRECTION: IQR for Ex2 will be 7.5 - 3 = 4.5.

[@johngelmarckbustillo4413]

Thankyou for this. You really saved me 😥

[@bakheetasalmansoori]

very clear, thank you so much

[@AbdurRahman-pz9kk]

Nice...

[@MANPREETKAUR-rl3ie]

thanku you so much sir for this incredible explanation

[@yanira7444]

Excellent explanation! Thank you 😊

[@e-glance3655]

Very informative, Thnx very much Mr. Anil Kumar ...

[@komalpayari8111]

Thank you sir ji 🤠

[@MathematicsTutor]

Playlist for you: ruclips.net/video/wcuDtKN3ZAQ/видео.html
Thanks

[@3607458]

thank you sir for the help..

[@_chade]

Thank you sooo much!!

[@Kylaknowws]

Thank you!

[@SaramZafar]

God bless you!

[@netanjabrink4972]

Thank you so much for this video. Saved me a lot of frustration. Excellently presented.

[@priyathamsamuel]

Thank you🙏

[@tonycl568]

Thank you. Now I understand :)

[@nasimfatima3187]

Oh thank u so much with tear eyes... Its help me so much

[@k_chetan_gupta]

nice explanation and easy to understand

[@larbiemmanuelayisi4995]

Thanks and God bless you for such a great work.. Keep it up

[@MathematicsTutor]

Thanks a lot for appreciation. All the Best!

[@BlueSkyGoldSun]

Saved my life thank you

[@ndlovukazi135]

Best explanation. I love the 0.5, 0.25 and 0.75 they make it so easy to understand. Thank you so much

[@MathematicsTutor]

Thanks for appreciation

[@XxMachuRicuxX]

Awesome thanks

[@marianaspognardi8638]

understood

[@mohammadmahmudulhasan6832]

Thanks Sir ❤

[@CommonLyphe84]

Very helpful thank you was doing Biostats and i missed that lecture and tutorials so was logging behind but just one watch and i got it it....clear, simple and easy to understand

[@MathematicsTutor]

Thanks and All the Best!

[@aishahassan7588]

Sir may god bless you

[@MathematicsTutor]

Thanks a lot

[@HungTran-mn2nf]

Thank you so much. The video was very helpful !

[@MathematicsTutor]

My Pleasure. Thanks for appreciation.

[@rahamatullah8005]

It's very easy to understand. Thanks for your video. It worked for me well.

[@puritypaul-yx3tc]

Thanks 👍

[@labonipaul1917]

thnk u

[@EnvironCyclist]

thank you sir..

[@dumplingzzzmastezz5201]

your the best teacher ever

[@harshadrathod7875]

Nice video for the students
Nice communication

[@MathematicsTutor]

Thanks for appreciation.

[@wandipebenny5597]

Thank you so much for well explanation I fully understand the lesson 🙏🏿❤

[@jerryaguylovlog9876]

4.5 the iqr of the second example thank you

[@samsulhoque888]

good

[@nirmeenh7022]

thank you , it is very helpful

[@MathematicsTutor]

Related video: ruclips.net/video/-VT19GWnduc/видео.html
Thanks

[@marthatolkeins8201]

Thank you, thank you, thank you.... Despite the errors it was really helpful with my assignments and this simple methods i will bury them in my brain forever.

[@MathematicsTutor]

Great!
Thanks

[@mwanikimurage3355]

Second example, inter quartile range 7.5-3=4.5 not 3.5. Otherwise very helpful method especially the idea of using 0.25 ,0.5 and 0.75

[@xboy_active_legion]

Good explanation. Thank you. BTW the answer for the Example 2 is 4.5, however this is not important.

[@meatpie456]

Thank you very much Anil! You saved my life for my statistics exam :)

[@alagiesambou4271]

THANKS so much sir please i will to know which other area do you teach i am an economics major in the university of the Gambia so that i can be following you on youtube

[@ebrimabah1052]

Thank you very much for that wonderful explanation, it is common sense we are all human.

[@MathematicsTutor]

Thanks for encouragement!

[@ebrimabah1052]

@@MathematicsTutor Really you are great. I spend almost 2 hours listening to lectures on this yesterday, I didn't even have a glimpse of what the lecturer was saying, but just 10 minutes of your explanation here I am alright. Once again thank you

[@MathematicsTutor]

@@ebrimabah1052 WOW. Thanks a lot. You may like to look into one of the related Playlist: ruclips.net/p/PLJ-ma5dJyAqprvhO3Ki6LrW7kR1U-s1pL
All the Best!

[@fatimamuibi4271]

@@MathematicsTutor it really helped

[@GeoKimem1219]

thank you Anil Kumar. The video is clear and understandable. But for the second example, IQR is 4.5 (7.5 - 3) not 3.

[@MathematicsTutor]

Thanks for the correction. IQR for Ex2 will be 7.5 - 3 = 4.5.
Thanks for your time and feedback

[@Homeopath_canada]

nic

[@biniyayusif9986]

In example 2,4 was appear 2times but you put only one and use 8 which appear in only one place but you put it twice

[@zdkfz1]

it is wrong: in example number two, Q1 and Q3 are not correct, since it is not the middel point. The position is 3.25 and not 3.5, same for the position of Q3: 9.75 and not 9.5. Therefore the value is not in the middle between the two points.

[@MathematicsTutor]

Thanks

[@ivanho2438]

No, Mr Kumar is correct

[@bradleyr4451]

Very nicely done! I saw another video where if the set of numbers is even you would find the median, then just "add in" that number to the set of numbers, then you can find the 1Q and 3Q as if its odd? But youre saying no, if you apply the formula as q1 = .25 x N +1 and N + 1 is odd? then you take where that lands and average out those 2 numbers. This is a totally different number. Another teacher was teaching that way of finding q1 and q3. That would mean in Example 2, the median is at between the 5 and 6 or 5.5 but now you add 5.5 to the set so N = 12 becomes N = 13 and q1 is 3 but q3 is 7 (not 7.5). Can you speculate on why a teacher would present the way to find q1 and q3 that way? thank you

[@MathematicsTutor]

I prefer to keep things simple and try to explain the way I can understand easily. That always help.
Thanks for your appreciation and keen interest. All the best!

[@nicholas5897]

Where did you get 1 fourth from?

[@PriyankaSharma-yh6sb]

Hello Sir, I am new to this channel. Have you covered all the topics of statistics of 12th level ? where can I find them

[@MathematicsTutor]

You may search different topics by including Anil Kumar playlist in your key words. Try it out and the let me know if that helps. Thanks
Here is one playlist: ruclips.net/p/PLJ-ma5dJyAqpldIsYj12SbqSpPDfyITE5
ruclips.net/p/PLJ-ma5dJyAqpHrVLEPUD6VV3CHxKlDzhn

[@pujathacker3879]

In the second example, IQR would be 4.5 instead of 3.5.

[@tiffanyloupias-young2748]

do you always use (N=1)Q1

[@keithedwards2841]

Can u do an example when u have grouped data?

[@MathematicsTutor]

Here is an example for you Quartiles with Group Data: ruclips.net/video/egGyi9QJCQ4/видео.html

[@ritizranjan9127]

Very nice broad minded teaches

[@MathematicsTutor]

Thanks for appreciation.

[@thaichinlee4321]

i have an enquiry. Let say, i have 10 numbers,
1,2,3,4,5,6,7,8,9,10. How do i get the Q1 and Q3?

[@glorysunday7077]

The second IQR is 4.5

[@rahulranjan1967]

I think Q3 in 2nd ex should be 7.75.
Am I wrong?

[@subbareddymeruva]

Hi Anil Kumar Sir,Your explanations is very nice,but I have a doubt about quantiles,when I run the quantile command in R with your data,I got different answer.Here I am posting the answer is
> q4=c(2,3,1,4,6,8,9,10,12,3,4)
> quantile(q4)
0% 25% 50% 75% 100%
1.0 3.0 4.0 8.5 12.0
but in ur example 75% is 9,please clarify my doubt sir,i am very confusing in this.
Thank You Sir.

[@komalpayari8111]

You are not arranging the given data in ascending or descending order
May be
That's why you are not getting the
right answer 😅

[@adityapandey1569]

IQR for second problem should be 4.5

[@mohamedosamakhan3140]

Q3-Q1 = 7.5-3= 4.5

[@MathematicsTutor]

True

[@apilchaudhary3094]

Why (n+1)

[@nabilashah8853]

Tnx sir .but second example not understand. Sir

[@MathematicsTutor]

There is correction in Example 2: CORRECTION: IQR for Ex2 will be 7.5 - 3 = 4.5.
That should help. Thanks

[@gosalynalvaro9264]

7.5-3=3.5?
Maybe it's 4.5

[@MathematicsTutor]

Thanks. That is a correction which is required to be done.
Appreciate your feedback.

[@bread0812]

I be Savvy

[@re_di_roma_is_back2388]

It's wrong. It's not the simple average between two consecutive, order numbers but a weighted arithmetic mean.

[@jacobmatura5571]

thank you for the lecture but how comes 7.5-3=3.5.....no way

[@MathematicsTutor]

IQR is 4.5 as written in the comments. Thanks

[@nirvanaamjad3573]

Play on x1.75 speed and thank me later :)

[@pushupmaths3465]

Thankyou...but you can't say .25 will give you the average of two number...... 0.5 gives you the average of two numbers..
Kindly make the changes sir coz ur answer is wrong ( According to Linear Interpolation method)

[@user-zi4nq4re9n]

Note:the biggest and the smallest value doesn't count ever

[@selfmailgrao7907]

sir 7.5 - 3 = 4.5 not 3.5 sorry to say; but supereb explaination

[@MathematicsTutor]

True, that is correct.
Thanks

[@tariqalenzi376]

not correct at alllllllllllllll >>>>>>> Q1 = 3 Q2 = 4.5 Q3 = 5.5

[@MathematicsTutor]

True, the correction in calculations has been already included in my comments. Normally, that part is overlooked.
Thanks

[@joeldaganio8567]

IQR for example 2 is wrong. It should be 7.5-3=4.5

[@MathematicsTutor]

Thanks. You are correct. I have incorporated that as comments. Thanks for the feedback.

[@petergeorge1690]

reeeeeeeeeeee

[@usmansiddiqui7821]

1 saal me aik lafz bolrha hai hai

[@zeeshankhanyousafzaivlogs91]

This video wasn't so useful

[@harshadrathod7875]

Nice video for the students
Nice communication