Statistics - Free Formula Sheet: bit.ly/47zjTVT Final Exams and Video Playlists: www.video-tutor.net/ Full-Length Videos & Worksheets: www.patreon.com/MathScienceTutor/collections Next Video: th-cam.com/video/STSP8gTSdT8/w-d-xo.html
I love how when we needed to learn something number related and we cant understand anything from the books, teachers, recording, and the web, this is where we all end up
To find Quartiles use this formulas for grouped data Q1 = n/4, Q2 = 2n/4, Q3 = 3n/4, To find Decile use this formulas for grouped data D9 = 9n/10 To find Percentiles P99 = 99n/100 where n is the sum of frequency.
Alright people arent catching his mistake here. At 13:50, 10 is not the 4.25th postion since the 4.50th position is 10. For example, 3.76th, 7.23th, 4.97th, you cant just go and add up the 2 numbers and divide by 2 to get your answer. The only time where you can do that is when the position ends in a 50th so like, 3.50th, 4.50th, etc etc. The guy in the video is missing a step called interpolating which requires creating the fractional equation of the differences.
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Professor Organic Chemistry Tutor, thank you for an incredible introduction to Quartiles, Deciles and Percentiles using a Cumulative Relative Frequency Table. Although I have seen this material before, this is the first time that I have some understanding of how to calculate the deciles and percentiles using a cumulative relative frequency table. A basic course in Statistics would improve by overall understanding of this topic.
Thank you so much sir, your explanation is clear than my teacher, since we sped up the lesson without with the better understanding of the topic, now your tutorial help me alot.😊
what the heck are you saying? it's 10 when you get the midpoint of the two values 9 and 11 by adding them up first and dividing by two you will get 10.. you didn't follow quite well
@@jayralph7165 its not 10, 4.25th postion cannot be 10 since the 4.50th position is 10. For example, 3.76th, 7.23th, 4.97th, you cant just go and add up the 2 numbers and divide by 2 to get your answer. The only time where you can do that is when the position ends in a 50th so like, 3.50th, 4.50th, etc etc. The guy in the video is missing a step called interpolating which requires creating the fractional equation of the differences. Hope people can see through this mistake.
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Thx for sharing. Bt wrong answer for q1 and q2. the answer for Q1 and Q3 is not just simply find the median of minimum (or maximum) value and Q2. In you calculation, location of q1 4.25 and q3 12.75 are right, but (9+11)/2=10 is not the right q1. Correct answer should be Q1=4th+(5th-4th)*0.25=9+(11-9)*0.25=9.5. Q3=12th+(13th-12th)*0.75=19+(20-19)*0.75=19.75.
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On the quartiles, percentiles and deciles ,when a decimal point occurs, we incorporate linear interpolation Eg in example (16:00) 60th percentile = 60/100 (16+1)th value= 10.2th value= 10th value +0.2(11th value - 10th value) = 10 + 0.2(17 - 16) =10+ 0.2(1) = 10+0.2 =10.2 . This also applies to the rest of the examples with decimal points. We deduct the next number (11th value) to the found value (10th value) and multiply by the decimal point (0.2). 0.2(17-16)
Young man! Very well explained!! Not once did you use “ugh “ cough or make me doubt you. Absolutely great job and the visuals!! Thank you so much for multiple examples!
Am I doing my Statistics Homework at 4 in the morning? Yes Thank you very much Human Our Prof. Hasn't explained this but classes are suspended but the Work wasn't. tHaNk yOu
I think the answer in 13:33 should be 9.5 since the location is 4.25, meaning P_25 will be located 25% starting from the 4th term (which is 9) to the 5th term (which is 11). I think getting the average of those two terms will only be applicable if all of the given terms do have common difference.
I was stuck at this point but you cleared it out. So averaging only works when the terms have a common difference. if not, we use interpolation. Thank you!
I did a trial of finding the midpoint of the 50th and 62.5th percentile (23:13), and the result is the same, it's 56.25. So we can really estimate that 16 (the first 16) is the midpoint of the 50th and 62.5th, which is 56.25 (approximately 56). But yeah it's just an estimation.
Hello, thank you for this video. It is really supportive since it helped us to remember the formula of how to calculate quartiles, deciles, and percentiles. However, I would like to know the value of decimals when you are saying that whole number with some decimal numbers must be calculated using the midpoint between the location of the whole number and the next number to that position. I would like to know the reason why you don't care about the decimals that you got when calculating. for example, when you get 10.3th you could have used 10th + 0.3(11th-10th). I will be happy getting the feedback from you soon.
on your example which is 10.3th place. get the two whole numbers in terms of place involve (10th and 11th place). use the Higher value (the value of 11th place) subtracted by the Lower Value (the value of the10th place) then multiply the result by the decimal (0.3) then add the lower Value (the value of the 10th place) then you got the 10.3th place.
Hello Sir, apart from your missing explanation on interpolation, I want to add about grouped data. The complete explanation on how to calculate above for grouped data is missing, If anyone is reading my comments please do reply whether these all parts are taught in this course or not.
Statistics - Free Formula Sheet: bit.ly/47zjTVT
Final Exams and Video Playlists: www.video-tutor.net/
Full-Length Videos & Worksheets: www.patreon.com/MathScienceTutor/collections
Next Video: th-cam.com/video/STSP8gTSdT8/w-d-xo.html
I love how when we needed to learn something number related and we cant understand anything from the books, teachers, recording, and the web, this is where we all end up
Exactly 🤗
To find Quartiles use this formulas for grouped data
Q1 = n/4,
Q2 = 2n/4,
Q3 = 3n/4,
To find Decile use this formulas for grouped data
D9 = 9n/10
To find Percentiles
P99 = 99n/100
where n is the sum of frequency.
2n/4 is the same as n/2
I'm not getting how to calculate the decile
The Organic Chemistry Tutor never disappoints.
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Alright people arent catching his mistake here. At 13:50, 10 is not the 4.25th postion since the 4.50th position is 10. For example, 3.76th, 7.23th, 4.97th, you cant just go and add up the 2 numbers and divide by 2 to get your answer. The only time where you can do that is when the position ends in a 50th so like, 3.50th, 4.50th, etc etc. The guy in the video is missing a step called interpolating which requires creating the fractional equation of the differences.
Appreciate the lucidity! This cleared my longstanding question of "How to calculate percentiles?" ;)
I know Im asking the wrong place but does any of you know a tool to log back into an instagram account?
I was stupid forgot my login password. I would love any assistance you can offer me!
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Me too. I have really learnt a lot from his videos
Professor Organic Chemistry Tutor, thank you for an incredible introduction to Quartiles, Deciles and Percentiles using a Cumulative Relative Frequency Table. Although I have seen this material before, this is the first time that I have some understanding of how to calculate the deciles and percentiles using a cumulative relative frequency table. A basic course in Statistics would improve by overall understanding of this topic.
Thank you so much sir, your explanation is clear than my teacher, since we sped up the lesson without with the better understanding of the topic, now your tutorial help me alot.😊
13:50 The 4.25th position between 9 and 11 is not the middle of 9 and 11 (ie 10), but the .25th of it which is 9.5
Yes, exactly. So what is Q1 in this case? 9.5 or 10? This is where I'm stuck.
what the heck are you saying? it's 10 when you get the midpoint of the two values 9 and 11 by adding them up first and dividing by two you will get 10.. you didn't follow quite well
@@jayralph7165 its not 10, 4.25th postion cannot be 10 since the 4.50th position is 10. For example, 3.76th, 7.23th, 4.97th, you cant just go and add up the 2 numbers and divide by 2 to get your answer. The only time where you can do that is when the position ends in a 50th so like, 3.50th, 4.50th, etc etc. The guy in the video is missing a step called interpolating which requires creating the fractional equation of the differences. Hope people can see through this mistake.
How do you get the .25 and the .75? To find Q1 and Q3😢
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Thx for sharing. Bt wrong answer for q1 and q2. the answer for Q1 and Q3 is not just simply find the median of minimum (or maximum) value and Q2. In you calculation, location of q1 4.25 and q3 12.75 are right, but (9+11)/2=10 is not the right q1. Correct answer should be Q1=4th+(5th-4th)*0.25=9+(11-9)*0.25=9.5.
Q3=12th+(13th-12th)*0.75=19+(20-19)*0.75=19.75.
i noticed it too, i think the answer for 10 is 4.5 not 4.25, (correct me if im wrong)
Thanks this clarifies my confusion
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On the quartiles, percentiles and deciles ,when a decimal point occurs, we incorporate linear interpolation Eg in example (16:00) 60th percentile = 60/100 (16+1)th value= 10.2th value= 10th value +0.2(11th value - 10th value) = 10 + 0.2(17 - 16) =10+ 0.2(1) = 10+0.2 =10.2 . This also applies to the rest of the examples with decimal points. We deduct the next number (11th value) to the found value (10th value) and multiply by the decimal point (0.2). 0.2(17-16)
I noticed he didn't do this, but my lecturers did.
Depending on the level of learning, whichever method is acceptable.
@@minigoal4672 Do you have your own lectures?
The video is very helpful. Can u please explain when to take the exact lowest value for the percentile point and what to do when it ties?
the fact that i understood this quicklier from the video than a 2 hour long session baffles me..
Young man! Very well explained!! Not once did you use “ugh “ cough or make me doubt you. Absolutely great job and the visuals!! Thank you so much for multiple examples!
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my teacher said that if ever we are solving for the value of Q1 we should always round up and if Q3 then we should round down.....so confusing :
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Am I doing my Statistics Homework at 4 in the morning? Yes
Thank you very much Human
Our Prof. Hasn't explained this but classes are suspended but the Work wasn't. tHaNk yOu
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I think the answer in 13:33 should be 9.5 since the location is 4.25, meaning P_25 will be located 25% starting from the 4th term (which is 9) to the 5th term (which is 11). I think getting the average of those two terms will only be applicable if all of the given terms do have common difference.
Linear interpolation
Yeah. I agree with you
Yeah similar in 15:17 i think we should just copy the decimal number instead of getting the average of the 2 numbers
yep, he was doing it wrong. There is another formula you need to apply after you get the location.
I was stuck at this point but you cleared it out. So averaging only works when the terms have a common difference. if not, we use interpolation. Thank you!
Thank you very much 😢😢it was really helpful😩 😊♥️i was struggling really hard with stats... But these videos just helped me out.. Thank you ☺️❣️
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I did a trial of finding the midpoint of the 50th and 62.5th percentile (23:13), and the result is the same, it's 56.25. So we can really estimate that 16 (the first 16) is the midpoint of the 50th and 62.5th, which is 56.25 (approximately 56). But yeah it's just an estimation.
Thanks man. Just needed a brush up on this. Helped me!
Maths concepts simplified. Thank you.
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Hello, thank you for this video. It is really supportive since it helped us to remember the formula of how to calculate quartiles, deciles, and percentiles. However, I would like to know the value of decimals when you are saying that whole number with some decimal numbers must be calculated using the midpoint between the location of the whole number and the next number to that position. I would like to know the reason why you don't care about the decimals that you got when calculating. for example, when you get 10.3th you could have used 10th + 0.3(11th-10th). I will be happy getting the feedback from you soon.
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SOMEBODY REPLY !!
on your example which is 10.3th place. get the two whole numbers in terms of place involve (10th and 11th place). use the Higher value (the value of 11th place) subtracted by the Lower Value (the value of the10th place) then multiply the result by the decimal (0.3) then add the lower Value (the value of the 10th place) then you got the 10.3th place.
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How did it go?
13:48 maybe you should use interpolation method. that will be equal to 9 + 0.25(11-9) = 9.5
The video is extremely helpful. Thanks
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Hello Sir, apart from your missing explanation on interpolation, I want to add about grouped data. The complete explanation on how to calculate above for grouped data is missing,
If anyone is reading my comments please do reply whether these all parts are taught in this course or not.
is its compulsory to arrange data in ascending order to calculate quartile, percentile, decile for ungrouped data?
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hi, do you recommend using interpolation method?
sometimes you make a number to be a datapoint some times you average data up so it is data point little bit confuse
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Given a tabulated score of 54 students who took an examination and solve for Q2, D8,
P65
Class Frequency
Thank you so much