Statistics Lecture 1.5: Sampling Techniques. How to Develop a Random Sample

[@etlens]

when the professor asked:" how many people understand what I just talked about?" I raised my hand...in front of my laptop.

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me too

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and he makes learning fun.

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I have an upcoming Summer Statistics Class and decided to view some lectures online, and have been taking notes with professor Leonard who seems like an excellent Professor. At the same time I was like "I wish Merced College had professors like this" and then I found out he teaches at Merced... mind blown! Small world. Had to rewind like 3 times to make sure I wasn't hearing things!

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There are still people who are willing to give their best. Leonard is definitely one of them taking all the time to cover the material in a simple easy to understand way.

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This prof is the most brilliant teacher of sampling. You clarified issues that my prof failed to do. As I watched I felt as a part of this amazing class.

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East African student

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You are a lifesaver. Thank you so much for making this video. I am taking a college class on statistics and my professor is terrible. If I could get away with it I would just watch your videos instead of attending class :)

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Gross

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You teach better than my professors here in France. Thumbs up

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I love paying $600 to take a class where I rely on some random dude on KZbin to teach me the subject.

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Professor Leonard isn't just a random dude, he is one of the best math teachers on the Internet. His ratings on "Rate My Professors" are incredible, he has a "Would take again" rating of *100%,* and almost all the ratings have called him "Awesome".

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Since thus cooties crap. I ha e t gears my instructors voice. The capus is shut down. There is no tutors or help. And Im behind.

[@clodialembounguennanda2414]

English is not my first language. in class , it was so difficult to understand all that stuff. i am so proud now because after this video , i went back to do my homework and i got everything correct. thank you professor, I am NOW ready for my test on .Monday

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I once again find myself watching Professor Leonard's videos in the interest of tutoring my own students. I'm starting to feel like I owe him a royalty. Given that his lectures are so efficient and understandable, why would I want to go anywhere else? (I'll conveniently fail to mention him to my students, though)

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look at the arms

[@Bilbus7]

I thought it was illegal to have guns on campus, let alone in the classroom?

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haha! I actually had a teachers with the last name of Guns...that joke was brought up a lot!

[@Lilysis123]

haha

[@DennisDavisEdu]

I thought the OP meant the instructor's arms.

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@@XanderGouws haha from the thumbnail I looked at the guns...

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2021 October,just discovered this as I work on my under grad.,he is better than my teacher.

[@AhmedDeedatPalestine]

This is the best lecture I had in statistics.

[@johnkim8160]

I have a B.A. in Mathematics and am an actuary. But I always watch this series once every so-and-so just to stay refreshed although I understand nearly all of it.

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Tushar Singh that's disrespect

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I only disrespect wahmen

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Hi John, Professor Leonard's video are extremely helpful as a refresher. I was curious about the actuary profession. How do you like what you do so far?

[@jillyburt]

observation vs. experiment observation - measures specific traits but does not modify the subjects ( polling) experiment - apply some sort of treatment and measure effects on subjects (control and test groups)

[@TanyaRomelus]

Great professor helping with stats right now. Love how detailed he is.

[@baroneasterling7080]

BING!!!!!!! I GOT IT.... youre going to help me pass my elem stat exam this afternoon !! THANX PROFESSOR LEONARD

[@adelemtonga2944]

truly you are a great teacher. I was so blank but now am getting the hang of it..

[@weekendresearcher]

Look it's a math teacher, no a statistician....no, he is clark kent (superman)

[@adelemtonga2944]

truly you are a great teacher. I was so blank on this topic. I just like the easy way of his explanation.

[@Samanthaq3031]

Thank you for making these videos you are helping me through my college stat class

[@jcanstar]

Simple Random Sample (SRS) is defined as every subject in a population has an equal chance of being selected. When you chose 5 from each group, that would be stratified sampling.

[@j3suschick]

Love how well you explain everything! Actually gets me interested in knowing more hahaha

[@dalisabe62]

It goes to say that there is no such a thing as random sampling, because the idea of randomness alone can’t survive the very idea of bias. Randomness in many contexts is akin to turning a blind eye on something that must be present to achieve fair representation. This is more so of a case when certain subgroups in the population share major needs, aspirations and conditions. The idea of random sampling may work for material subjects, but not much for humans--another distinguishing factor that should be considered when sampling to achieve good representation of the population. So before considering stratum sampling, the degree of consent on certain characteristics within the subgroup should be accurately assessed. If, for instance, we are trying to find some statistics about the birth rate among the American population which consists of several racial and ethnic groups, we may not hit it right if the birth rate among such different groups varies drastically. By the same logic, if within the same group the birth rate is so drastically different, it may not help much to include such groups in the proposed stratum sampling. In any case, sometimes census is the only way serious parameters could be measured. Voting polls are misleading because the effect of the polls on the election predictions themselves as pointed out that no one would want to vote for a losing candidate. In as much as the idea of inferential statistics is tempting, in many cases, cutting corners is not the way to go. It might be a good idea to employ a hybrid of sampling techniques and averaging them out. This should be no headache with the sophisticated computing power we have due to modern technology. There seems to be no substitute to trying many samples and comparing the results and choosing the ones that represent the population from historic time analysis.

[@riverarivera7960]

Sir, THANK YOU SO MUCH! Currently taking online Basic Concepts of Statistics, and I was going through the book like "wth I'm not passing this," then I made the best decision to come look for examples on KZbin, and ta-daa! Actually walked through the book with me and I don't even know what book was being used. LIFE SAVER! Made it so simple to understand!

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that is how i was before i found his vids.. he is the best.. :) I have saved him for my masters degree stats class.... :)

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totally watchable at 1.25 speed if any one is in a time pinch !

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Pathetic. 2 times or broke

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@@spandanganguli6903 pfft, 4 times minimum

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So attractive and smart.

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I'd like to see his lifting stats

[@ricardoafonso7563]

. THANK YOU STARTED REPEAT WATCHING 1.1 2 3 5....ETC .

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Okay, we have an atmosphere!

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Congratulations to 500k Subs Professor Leonard!

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907k now!

[@myliserta]

In the design of experiments, treatments are applied to experimental units in a treatment group, here called test group. In comparative experiments, members of a control group receive a standard treatment, a placebo, or no treatment at all. (This is a Wikipedia definition)

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I have learned from him, can listen to him and can watch him all day long. Totally a cutie.

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u r the best, like real yur work helps me much better, THANK U ND GOD BLESS U

[@rexgreen4396]

Great stats lectures, very informative and concise! But those arms are so distracting! 😂 Keep looking at them instead of the whiteboard

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he looks great and sounds nice. Thank you for the easy explaining I am trying to be prepared for a test.

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You become my favourite teacher ❤️

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A great teacher! I'm glad i fell on his videos.

[@understandingmaths1033]

Very clear run-through of random sampling techniques (I like the deliberate mispelling 'strata-fied'). It would be good to add some instruction on how exactly you randomise, including using the random functions on your calculator and the difference between random and pseudo-random.

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Thanks Prof. Leonard! This helps a TON!

[@GPTDavid]

Time to study stats i'll try my best Professor Leonard

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My god he is excellent at teaching

[@edwardburroughs1489]

It's strat-O-sphere and strat-I-fied.

[@jstanaba]

Edward Burroughs Yes... StratOsphere. The Stratosphere is also ABOVE the clouds. There are no clouds in the stratosphere. That is also what the B-52 Bomber is named after, The B-52 STRATOFORTRESS.

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How could you be like that, you are fantastic sir ❤

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i love his teaching

[@cthullik6719]

@proffessor leonard : systematic sampling from Vietnam draft. "1, 2, 3, Marine!"

[@HenriCamayo]

stats this stats that, what are the stats on those gains prof?

[@evanarielchristoper3979]

Can I know which book you use for this lecture, sir? This lecture was very good, I used it as complementary to my Statistics subject in my college. Thank you

[@waseemqaffaf5715]

Found the book?

[@cortez121219933]

@@waseemqaffaf5715 Elementary Statistics by Mario F. Triola

[@kcabrera0717]

OMG!! Que hombre tan lindo. Cannot stop looking at his arms. I wonder how he looks like today. By the way his explanation is very good.

[@johnholme783]

Nothing stiff and starchy about this man. Not your stereotypical maths professor. Cool dude.

[@hamzagodil3665]

Professor Leonard, can you let me know which book are you using for the source? I would love to know that and practice some of the problems from the same book

[@adelemtonga2944]

such a great teacher. .

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Clark Kent is a professor by day

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im waiting for bro to drop the workout routine fr

[@mohammedalsulaiman5903]

wonderful explaining. THANKS SO MUCH

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this is what we meant by conducive learning environment. I might be returning my interest on learning statistics... hehehehe

[@jhakimi-u4l]

some of the lectures are missing from your play list sir like 1.2 and 1.4. However you are fantastic and thanks for sharing these lectures. Ibrahim from Afghanistan

[@sameersalihy7546]

Mohammad Ibrahim Hazara تمام درس هاي اش است بيين به دقت

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@@sameersalihy7546 دوست عزیز سلام. مه به لیست درس ها رفتم و دیدم بعضی از لکچر ها نیست. تشکر سمیر جان ولی استاد جواب نداد حتما چک نکده

[@mdhayirmohamud595]

Really it was better to divide Sampling into 1. Probability sampling that is futher subdivided into a. Simple random, b. Cluster, c. Systematic And the 2. Nonprobability sampling that is subdivided into a. Quata, b. Convinence, c.purposive or gudgement and , self selection.

[@AccountingAvon]

thanks prof,!

[@roadtoad3484]

I wonder haw many people have watched this video while being in an upper level statistics class?

[@zac3600]

Perfect professor!

[@rajvurla]

i liked the explanation...on the samples

[@tenerife_sea]

professor leonard can like... get it.

[@kevinpreston5260]

@4:55, control group is the untreated group.

[@BeautylifewithAnna]

Thank you for the lecture.

[@neethadevadas2755]

What's the name of the textbook that you usually use for this class? I'm self-learning the introduction to statistics at the moment, and am looking at books to use. Please recommend if you can, thanks!

[@olutayofavour5137]

Elementary Statistics by Mario F. Triola

[@OlivierJoret]

Great lecture.. thank you

[@thetanuagrawal]

thankyou for the lecture sir .

[@radhikar5321]

Superb professor Leonard...I loved the his way of Teaching...Leonard can you help me to which book i need to refer.

[@sharanaroosh]

Dear Professor Leonard, I couldn't find Statistics Lecture 1.4 :( Could you please upload that? Thank you.

[@lorilihime]

+Shara Naroosh A lot of the time professors will skip sections of the chapters to avoid complete repetitivness or its irrelivent. This professor covers everything you need to pass any class so far as I can tell. I was stupid and believed I could take my statistics course online. I have been struggling untill earlier today when I came accross these lectures. Decided to review from the beginning. Everything seems so obvious now! Amazing what a good lecture can do :P

[@rpprevost]

For "Convenience Sample", you defined it as the use of RESULTS that are easy to get, but shouldn't it instead be the use of the DATA that are easy to get?

[@adamcaul]

GEE WIZ. EVEN SUPERMAN NEEDS A SECOND JOB TO PAY THE BILLS!!

[@marygaga1282]

He reminds me of ZACH from SAVED BY THE BELL 😀

[@mellmorris2003]

clark kent indeed

[@whysosad2973]

what book is he referencing from?

[@isaacamoahdarkwah9037]

Please, how do I get the text book to read 1.4 and also take part in the assignment.

[@aravindelumalai3101]

Hello Professor Leonard, Can you please let us know the book your using for this class ?

[@vineetjhaveri3914]

Aravind Elumalai Name of the book is: Elementary Statistics - Triola

[@TarunSingh-je9my]

@@vineetjhaveri3914 Thanks Vineet 😊. Can you also help me with probability book? Which one I should buy?

[@Saracast1979]

So helpful! Thank you!!!!!!!!!!!!!!!!!!!!!!

[@TheAntiYuu]

omg he's viral on Imgur

[@jainPrisha]

Hello. Please share the reading material that you are referring to for this course. Thanks in advance

[@olutayofavour5137]

Elementary Statistics by Mario F. Triola

[@samsonshaul3240]

My mom: what did you learn in class today? Me: I think I might be gay.... 😂😂😂

[@TheRealPaiMei]

Tf?

[@missygeisha]

im not even listening to his lecture.. just drooling looking at his arms.. can he please come to my sch??

[@schwiriken]

Which textbook is used in this course? name, edition, etc.? So i that its possible to read and do the excerises Professor Leonard indicates.

[@Newslinetv24]

I have a group of random numbers but I will like to know how to calculate so I can get what next random number to appear

[@adoniskon1783]

the best !

[@shantanulokhande3730]

can anyone tell me what are the "readings" that the professor is referring to in this lecture? is there any specific book ?

[@mariakosberg9244]

I really enjoyed this video. I have a question and perhaps this is answered in one of the videos sequences, but how many responses much one receive from a survey for hypothesis testing to be accurate?

[@bliss1086]

excellent

[@TejasKd221B]

I wouldn't mind you being Superman instead of Henry Cavill. Seriously.

[@thiduyenbui9261]

Could anyone help me to answer this question please? . are stratified samples simple random samples? I get a bit confused at the "Stratified sample" method. It doesnt sound that we are making random samples because if we break the population into smaller groups and pick randomly, for example we have 5 levels of education and each level is one subgroup, then we prioritize to have samples which include all levels of education. It means that you miss out samples which maybe only contains 4 or 3 levels of education. In the beginning, we have a very clear definition for " a simple random sample is EVERY SET OF n individual has an equal chance of being sampled", in the stratified sample we dont let every set has an equal chance of being sampled.

[@jaskaransinghsaluja2106]

What is the book recommended by Professor Leonard?

[@lorilihime]

What book are you using? From what I can tell, it seems to be along the same lines as my current textbook

[@vineetjhaveri3914]

LoriliHime Name of the book is: Elementary Statistics - Triola