Sampling Methods and Bias with Surveys: Crash Course Statistics #10

[@crashcourse]

Hey all, fill out the official Crash Course Statistics Survey: bit.ly/2J1zimn And if you don't want to, help us fight non-response bias by filling out anyway! We'll be analyzing this data in future episodes. (All individual data will be kept anonymous.) - brandon

[@vikurtz]

I assume we'll be seeing the results in the next episode?

[@sisyphyus]

That last question... Just, so poorly constructed I hope the survey wasn't hijacked. Otherwise, it was weird but that only makes the whole thing and the data you collect from it and then what are you going to show us from it, and how does it... BLARG... MUST wait for "results show"... "mumble, mumble, reality contest shows, mumble, mumble, rigged outcomes, mumble, mumble, Adam Lambert should have won, mumble mumble..."

[@jakob7184]

I did my part

[@ianmitchell750]

What’s your plan with the gang of raccoons?

[@kyoung21b]

CrashCourse - Raccoons are tough !

[@cloudpoint0]

I wasn’t going to comment, but you convinced me to do so, just say that you are noteworthy, Adriene.

[@kennethschlueter9338]

Shout out to us who don't usually comment on things but did this time because she implied we don't enough!

[@ArcXAmethyst]

😄

[@danielhajas307]

Same here. Actually, I have never in my life commented on KZbin, but I must say, Adriene, and the channel is totally noteworthy. Thank you for all the great content, I love it.

[@aka_pcfx]

I'm just leaving this coment to inform you that you did an satisfiing job at entertaining and educating me.

[@celestemoss1141]

Adriene, you are definitely noteworthy! Love this series!

[@kickholland]

I'm commenting (something i generally don't do) to say that this course and the econ course have both been super useful to me just recently

[@CharlieRivasJr]

You're noteworthy, as I enjoyed watching your videos. They are very educational and are way better than traditional classroom lectures 👍

[@drag0nblight]

You're noteworthy, Adriene! This topic actually is one of my interests. Thank you for the effort. 😍😍😍

[@arjitsakhuja3062]

Adriene, You are not only noteworthy but a witty, funny and a very good presenter as well. I am in love with you after watching all these tutorials. I am gonna keep supporting this channel on patreon. Thank You!

[@Veeeee.]

I'm LOVING this series!! Can't wait for the next episode already.

[@siddharthsingh9700]

And BTW, Mrs. Hill... you are always noteworthy.... I am following you since your Economics Course...

[@koobert]

I feel like I'm overestimating my resilience to raccoon attacks.

[@iisgray]

I honestly feel like I could take on a lot of racoons. I mean, they're small, and presumably have little to no knowledge of basic strategy and very little comprehension of tools. I feel like if everything worked out in my favor and I could evade them for long enough, I could just turn them into a real life mob grinder and take on infinite raccoons. The answer I put was based on the idea that I do not succeed in this, and am forced to fight in the open but am allowed access to dedicated fighting tools

[@ashnaalex6887]

Cramming last minute for a stats exam and this is soooo helpful! Thank you so much!

[@ummillyaas459]

Same here!

[@Alverant]

I was asked to take part in a survey where they compared a political candidate to a clown. Definitely a leading poll.

[@JimFortune]

Alverant Some people lack the proper respect for clowns.

[@danielmclaughlin5573]

They didn't compare him to a clown... Donald Trump IS a clown...

[@TheKitKatProject]

Daniel McLaughlin That’s frankly an insult to clowns

[@MrGustaphe]

That wasn't a survey, it was the election.

[@ZamanSiddiqui]

Don't Forget To Be Asking Questions.

[@alexandertownsend3291]

Don't forget to be doing what? I forgot what it is.

[@Lao_Zi_369]

Thanks!

[@thepaqcrew]

Thank you for the awesome crash course on stats! Going back to grad school and haven't taken stats before yet a two hundred level stats class is part of the curriculum! You are saving me!!! Keep up the great work!

[@stelluspereira]

You are very much appreciated with your work in explaining stats in a very simple format with excellent examples& understandable to everyone, many times for clarity I revisit your channel, keep up the good work Ms Hill

[@jerushadsouza8515]

You are noteworthy! Love this series!!

[@BirdRaiserE]

I just want to say that, without fail, each time I click on one of these statistics videos I get that Google ad stating that teams wearing blue are more likely to win. In fact, Google has several versions of this ad and each states a statistics based fact that seems like it was misinterpreted from a data set... right before a video about interpreting data. It's too meta for me.

[@pyrotheevilplatypus]

It's like that "4 out of 5 dentists recommend [brand]" - The original question was "Which do you recommend, [brand] or not [brushing, flossing, using mouthwash, etc]?"

[@katerinapanina1026]

Thank you, a very good description of all possible limitations 😊 I know, that this is the course in statistics, but it would be also interesting to see something on qualitative methods and how two can be combined

[@menglongyouk167]

thank you, noteworthy host and staffs.

[@GajanaNigade]

You are noteworthy. This series is noteworthy.

[@bobfearnley5724]

Amazing content! I have never heard of so many kinds of sampling methods.

[@ondrejdunder6808]

Who loves CrashCourse??

[@lerolerolerolerolero256]

who doesn't??

[@ajax7x388]

it's one of thr33 or for channels im subscribed 2 rogan, vsauce, somthing else maybe. but my utube addiction is growing

[@Ngamotu83]

This is a good explanation for why an online poll like Rotten Tomatoes is unreliable. ;)

[@whiteflagstoo]

Well its a bigger problem that movies can only be fresh or not fresh, and that is the metric that is featured most prominently. When you look at an out of 10 score on RT it's more normal.

[@Archie11587]

AWESOME! I've been waiting for this episode! Thank you so much!

[@joeyb649]

Awesome job showing a man as a stay at home parent! Way to crush gender norms. Men should not made to feel any worst than a woman; having not been or are the bread winner.

[@LaceNWhisky]

My old employer used to require employees fill out employee satisfaction surveys every year, and the questions were always super leading; in some cases the questions didn't even give an option to show dissent.

[@statistics5371]

Amazing course Thank you CrashCourse team

[@johnbagel2560]

How do you know I am not an evil dictator. Are you identifying me?

[@thequad8945]

OR, maybe he is evil dictator running a cybernetic empire, using false data to gather secret wealth from the shadows, like influencing the stock market, mistranslated key words to secretly indoctrinate people, cause wars with cyber attacks. Misinformation has to come from SOMEWHERE! Where else to start then from "innocent" you tube comments! (From a person who is DEFIANTLY not an evil dictator...not at all...would this face lie to you? :P)

[@FalbertForester]

Statistically, there are very few evil dictators, so the odds that you are not one are pretty high.

[@eaterdrinker000]

Hilarious wannabe-strongman U.S. Presidents have time to tweetstorm. Also, on a vaguely related note, I have a Joe Biden #47 Philadelphia Eagles custom replica jersey.

[@ajax7x388]

i don't think she has the means or motivation to identify u on the internet dan

[@robertpearce7795]

I'm not a dictator... :D

[@soniarebecca9669]

hearts for saying "different sex" instead of "opposite sex" ! great video :)

[@andrespalacios6540]

Surveys are data collection tools, they are not inherently experimental or non-experimental. In fact the most common way to collect data in an RCT is with surveys XD. As a rule of thumb, experimental methods are those where your treatment and control groups are randomly selected, quasi-experimental are those where they are not randomly selected and non-experimental are those where you don't have a comparison group. Surveys can be used in all of them. Still, this series is a great idea, keep the good work!

[@Energya01]

I wonder how many normal distributions will show up from this survey... Oh and my random number was provided by Google's rng ;D

[@matthewware8973]

Thats crazy

[@nglazgow]

You are noteworthy, Adriene!

[@siddharthrs7067]

You're noteworthy, Adriene!

[@astarte2607]

This really helps! Thanks!!

[@ArhamDFath]

just need to say that this course, and, Adriene Hill who was brought it is very noteworthy

[@cm374787]

The racoon question was tough to answer realistically, I live in Australia, I've never seen a racoon in my life and my likelihood of encountering one is virtually non-existent. That being said, I am Australian, defeating armies of cute dangerous things is pretty common place so here so it's hard to judge.

[@noneofyourbee-siness]

Before 50 views. Feeling lucky. Love you Crash Course 💕💕

[@hospitalityhero1698]

Thanks, I am using this material to help me become a data scientist

[@TheAyomikun]

Hospitality Hero same

[@artemrusalovski1143]

Hello Crashcourse, you are amazing! Awesome and mega cool. You are doing a very good thing! Have you thought about adding a few control questions, tasks and case studies? Granted, this is more work but this would make you even "pioneerier" :) May be the community will help?

[@siddharthsingh9700]

Kindly add something like this to the description... Types of bias in a survey... 1.Non response Bias 2.Voluntary response bias 3.Under-representation

[@TheKitKatProject]

*Adriene:* “...and since it’s statistically unlikely that any of you are evil dictators...” *Me:* “aw... dang.” :(

[@d.harrison1570]

The survey asks how many raccoons could you fight off before they overtook you. But it didn't give an option for all answers (I learned that from this episode!). I wouldn't fight them off. They are my little buddies.

[@Nokoli_]

Thank you for the amazing videos

[@anshgupta8560]

You know I absolutely love that you have started a crash course on statistics and I watch every video over and over again, but where is the next???? If not anything else, at least mention the date because if you don't send videos every week people will lose interest

[@Valdagast]

Can we get a Crash Course Evolution? With the most common misconceptions about evolution (e.g., that it's completely random) are addressed?

[@RilianSharp]

Ugh, I had to ask a bunch of kids a survey question that was written by someone else. It was "you never take things that don't belong to you" and they had to rate how true it was, and it was the only question in the list that was written with a negative, so i think that people were likely to answer it backwards. there were a lot of other problems with the survey, and i am annoyed that we weren't allowed to modify the survey for future participants as we noticed problems. the terribly-written questions were just not getting any helpful information.

[@bobfearnley5724]

Also, if this is not too much to ask, can you put sources and references in the description? A textbook section or even some useful links are good.

[@zOgOs48]

Bob Fearnley Thats data is for you to find. But, what would you like to know?

[@srikrishnasbhat9668]

How is stratified random sampling different than the randomised block design from the previous video?

[@mayavi93]

Had the same thought. It is almost the same I guess.

[@fowlerj111]

❤️ for using "different sex" instead of "opposite sex"!

[@FalbertForester]

You've mentioned random numbers a few times. Will one of the episodes cover 'random numbers are hard to get'?

[@smokierpizza]

I just filled out the survey you linked. Was it a test to see if we'd learned ANYTHING from this episode?

[@mahmoudabouzeid7969]

Just amazing !!

[@AlvaroJaramilloJr]

Snowball sampling reminded me of a joke! What's the difference between a Snowman and a Snowwoman? -Snowballs!

[@Valdagast]

That was terrible. I'm stealing it.

[@PurpleCloud619]

A good method I use while pondering is to do analysis on subject matters that are unknown to many or most of the population. Give it a go if you like, you’ll be surprised on how a lot of major functions in our Society got their jump from even the most trivial of things that we ignore or deem common.

[@Mo95793]

Thank you, thank you, thank you

[@KatrinaEames]

How long does the US census take to analyze now?

[@alantelemishev9335]

You and I both know people can't choose random numbers! 😡

[@joppe4899]

4 is guaranteed to be random.

[@murphygreen8484]

What are you talking about. I totally chose the random number 24

[@LaceNWhisky]

97. Ha!

[@roberts1677]

I usually just put Pi, or a reasonable decimal approximation.

[@tishsmiddy71]

Hi ! I have ask repeatedly to be taken of the list !!! Now i get 3 or more a day I SCREENSHOT them , I’m making list , so far I have 12 names ! Just started a week ago !! I’m Disabled and have young SON can’t afford to NOT answer the phone !!! I’d like to know who you shared my information with and take me off you list ????!!!???? Thank you 😊 The phone company Say’s if i do this and I have repeated calls they can help !

[@yunhee93]

Very very interesting

[@specialnewb9821]

Regarding 538.... I want them to do a story "Why can't 538 turn a profit?" ESPN is supposed to be trying to shop them.

[@vamsikrishna-fv7iw]

You're noteworthy , Adriene : D DFTBA

[@hassenfepher]

This video was remarkable in the fact that i have made a remark with regard to it. But, you know. Not too bad. Not like "woah!" But nice

[@noneofyourbee-siness]

It was fun filling up the survey🤗💕💕 Hit a like if you agree...

[@greyareaRK1]

You might be right, but I'm going to need a bigger sample group.

[@ikendusnietjij2]

I have a very positive opinion

[@MeggieDinosaur]

You!!! Are!!!! Noteworthy!!!!!!!!

[@Julesdoesstuff]

Do the survey y'all!

[@akashchatterjee7678]

you are noteworthy love from india

[@haeleon654]

Okay, hold it. Do you guys have a time machine to know the cost of the U.S. census in 2020??? If so, please send me the blueprints!

[@SirDominic]

William I - also know as William the Conqueror and that census was known as the Doomsday Book

[@specialnewb9821]

Guillame the Bastard.

[@amanjeetsinghbhatia429]

Hey I use this series in 2019 before my masters stats class to get an idea of what is going on. Thanks for the effort to make it all easy!

[@galaxi6585]

the pizza question was like WAY inaccurate cuz 1) I don't exactly count my pizza and 2) there are quarter slices and there are 1/8 slices of pizza. Which one?

[@Justanotherconsumer]

Just as a thought, the census is actually not that good, in spite of the cost. Lots of humans, lots of human error, etc... The recent concerns about people being intimidated by questions on the census being used to punish them (responder bias) and issues like the Jedi Knight census phenomenon (intentional faulty data) are problems inherent to the design. This course may praise the census, but that’s not a universally held opinion, and parts of the census are conducted by sampling to much controversy.

[@hem89180]

Love it

[@rkpetry]

*_...you could do what astronomers do and look at marital vs lifespan universally, (In other-words 'think of the universe as your larger experiment and collect your results')-but then again you're talking greco-bacchanalia/roman-saturnalia-wedding-marriage designed for gladiators-and-not-so-gladiators to do battle and die-away at empirically decreed ages..._*

[@123lightmovies]

please teach us analog and digital electronics according to those books written by nigel p cook

[@BoundInChains]

Yes.

[@pancreasnostalgia]

Wasn't Virginia Slims sponsoring women's tennis (including Billie Jean King) at this time?

[@emeraldemperor2601]

my cat is an all powerful evil dictator XD

[@rusty894]

I have a very positive or a very negative opinion.

[@andrewpyck9104]

Monty Hall is media!

[@anshgupta8560]

WHAT HAPPENED TO THE NEXT VIDEO?

[@z26-b9n]

So what your saying is that they are usually bias no matter what so why do this In the first place to be bias.

[@leonginear123]

Please make Crash Course Calculus

[@danielmclaughlin5573]

CRASH COURSE CALCULUS !!!

[@zOgOs48]

Doh!!! Here comes the migraines.

[@dalobsta1793]

Confetti

[@ShuvamNayak]

I wanted to see the current result of survey. It was so damm funny.

[@MeIsGurlNow]

i just realized she had no idea about the coronavirus at all !

[@tishsmiddy71]

So do you HIRER in America ? Or source OUT this ???

[@hskIuvbot]

I’m taking a test on this please help

[@tishsmiddy71]

I wish i could understand most of the i speak with !!!

[@adamburianek9668]

Dont worry your noteworthy, im taking notes for a quiz on you right now XD

[@kayak0000]

7:10 Strata

[@inteli3i5i7]

You are definitely noteworthy Adriene.

[@DuranmanX]

Didn't 538 also predict Hillary would win the electoral vote with high margins

[@eaterdrinker000]

Technically, they predicted Clinton had the greater chance of winning (contingent upon the outcomes of "swing states" of relatively larger electoral vote numbers), but that percentage diminished considerably as November 8, 2016 drew near.

[@Je.rone_]

I'm learning statistics to*** become an evil dictator.

[@murphygreen8484]

What's a good Harry Potter house for a Muggle?

[@eaterdrinker000]

Dzerkinmaigherkin. [That's what I submitted.]

[@ea2ybree2y39]

noteworthy