An introduction to z scores
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- Опубликовано: 7 фев 2025
- z scores, definitions, bell curve, GSCE, GCSE
Revised videos and complete playlist on z scores
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David Longstreet Professor of the Universe
Professor of the Universe: David Longstreet / davidlongstreet
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My left ear is getting really smart. If only you could make another video for my right ear.
Gandalf Greyhame on my God I thought it was my ear phone
Hahahahaha I thought as well too
same. 3 seconds in i had an irrational anger lol
I added a link to a playlist on z scores in the video description of this video. This should help you understand the concept and anyone else in "Meluchi's" class.
Make sure you like MyBookSucks on FaceBook (see link in video description). This will help others find the educational videos.
Three hours of lectures and couldn't get it. 3 minutes with your video light bulb. Thank you!!!!
@ongolos when I first started doing these vids I used an standard simple microphone. Now I use a nice microphone two channels (left and right) and all my videos are in high definition too. I a plan on redoing all the old videos.
I love how you made use of visual media. The numbers were floating to the right places, the arrows were moving symmetrically. This is the way math should be taught; and you are an excellent brilliant man. I am sending out a lot of blessings to you!
You explain this so much better than my teacher, this is the THIRD math class you have helped me through! Two in my undergraduate, and now you are helping my in my Master's degree. And I learned everything I know about Excel for stats from you! Thank you so much!
@darrinpatterson The .34 is the area from the mean to one standard deviation away from the mean (z score = 1). The .1587 is the area to right of this. Note that .34 + .157 is just about .5000 which is the area to the right of the mean. You should be able to find these values in a table in the back of any stats book. "proportions of area under the standard normal curve."
@d3mur3 it turns out to be really small. The p value is the area to the right of the z score (if z score is positive) and to the left (if z score is negative). The p value for a z score of 1.96 is .025. If the z score is 2.9, then the p value is .0019.
I know this is frustrating, but there is a bit more -- in the normal table if you look up 1.96 you will see a value of .4750. (1 - .4750) = .025. The same is true if you look up 2.9. You will see the value of .4981 (1-.4981 = .0019).
@wopperjr In most z score distributions, an alpha level of 5% across two-tails is used as the critical point for rejecting the null hypothesis. That said, 47.5% leaves you 2.5% on each tail, which adds up to the 5%. Furthermore, if your score is in this 2.5% or a z score of more/less than +- 1.96, t is significant.
@SteevanNas sorry you can't hear. I have put all the z score videos in a place list on my channel statisticsfun called z scores.
I quite literally got more from this than an entire semester of statistics 112. many thanks
I hope you saw the newer videos on z scores. You can find the link to the play list in the video description.
For sure! That would be great. Let me know if there is anything else you need from me. You can find me LinkedIn (David Longstreet)
Working with Andy Field's "Discovering Statistics" book has caused much grief - this video simplifies things so much.
The numbers are actual derived from a pretty complicated equation. I do have an entire playlist on my channel that describes top to bottom everything about z scores. The channel is statisticsfun and the playlist is z scores.
Hi Statisticsfun Guy - I just wanted to let you know that I stumbled across your videos when doing a search for z-score information and found them very VERY helpful. I am studying to try to pass the DANTES test, and their study guide did not do a good job of explaining the information. I think your videos may have saved my day. Thank you!!!!
+Kate Doss You are very welcome! If you get a chance, like and share the videos, and like my FB page (www.Facebook.Com/PartyMoreStudyLess)
@stringcatt Well... good question (and I need to make a video on this) The .9750 is the total area below 1.96. In the video I talk about the area between the mean and 1.96 which is .4750 (47.5%).
Summary
Total Area below 1.96 = .9750
Area below the mean (where z =0) = .5000
Area between 1.96 and the mean is .9750 - .5000 = .4750
@stringcatt Yes you would be correct. This is confusing because the "normalized" tables at the back of stats books are not exactly the same. This seems to be a common problem and I need to do a video on this topic too.
Very well explained and I appreciate the clear illustrations/visuals
Man I wish you were my teacher. The teachers at my HS cannot teach.
Great video. It helped a lot
Hawk 411 hopefully the teachers at your college now can teach
Thank you much! you are making up for my professor who has trouble communicating concepts!
@gnuochtapir The Z score has no upper limit.... Z scores more than 3 are uncommon and so is anything more than 3 standard deviations way too. A z score of 4 is way out there and a z score of 5 is off the charts.
Thank u very much, this is just right. Did u use powerpoint to create this?
Well it turns out a I have entire playlist on z scores that I would encourage you to watch. The playlist name is z scores.
@baker70romeo you look up the z score in the body of the "normalized table" in the back of your stats book. Watch the video I attached above called, "Normalized z score question for statistics" -- also I have a playlist called z scores.
@stringcatt there is a good reason this is confusing you... because it is a really really hard problem. I am creating a video response and I should have it posted this morning for you.
Thank you soo much, my stats final is in the morning and this totally helped me.
Also well done - what are you using to make these videos..? Make some more, please.
~
@statisticsfun thats good , i hope its going to be better, I real think these vids are helpful but cant concentrate with all the noise the mic captures. I got EAX so it captures a lot out of the sound... its like anti BASS. Lookin forward to the new ones!
i think i realized the equation for z score. z score= standard deviation divided by the mean of scores. if the standard deviation is higher than the mean, then ur z score will be positive. if the standard deviation is lower than the mean, then ur z score will be negative.
try it :)
@statisticsfun So the .9750 includes the "yellow tail " to the left of +1.96 but not to the right of 1.96. .9750 + .0250= 100%? Thanks
is the 5% called the alpha value ? please if you make a video about that I would really appreciate if you put the link for me. I also recommend for you to record videos about statistical tests (inference), that would really help us. 3>
How high/low can a Z score be? How many standard deviations can there be in each direction?
@stringcatt I just posted an explanation video "Normalized z score question for statistics" You will see it as a video response.
how do you calculate the area under a normal curve when the z score is high? (for example -6)?
@statisticsfun okay so i was computing a z-score and it turns out to be 4.19 how do i find the p-value?
good illustration and explanation
@cool08player by george I think you have it!!!
What's the difference between z scores and standard deviation?
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Hi, I am an employee of WNS Global Services. Can we use this video in our training sessions?
I didn't know there was a z score table. But we can't use one so...how exactly do you get those numbers?
excellent video ...thank you
@holyorderoftruth isn't the z score for 1.96=.9750?
how did you get the 47.5 percent at 2:00 minute mark??
Great job of explaining.. Thank you.
Thank you 🙏 ( comment of 2019 )
Z scores are the number of standard deviations away from the mean.
Voice is very low. But clarity in concepts covered.
I can't be the only one who has absolutely no idea what any of this means lol
i actually got it! finally
woww really good explanation thx....very clear
ure a life saviour!!!
@statisticsfun ok, thanks!
My right ear feels educated.
Okay. Thanks!
why do all ur vids have the right speaker speaking only, can u get a better audio mic or recorder? hurts my ears cuz the audio is so bad.
Awesome, thanks
Thanks so much!
i HAVE A ? IF 5% OF BABIES CAN WALK BY 10 MONTHS AND 75% BY 13 MONTHS, WHAT'S THE SD AND MEAN? I DON'T GET IT. ANS: MEAN =12.1 SD= 1.3.
what is raw scores?
thanks, very helpful.
Thanks!
I just bought a BOSS Quiet Comfort 2 for $400 and guess what, only LEFT EAR WORKING! You just cant trust those pricey stuff anymore.
is this is a joke lmao
isn't the z score for 1.96=.9750?
This was a good video. explains it perfectly0
thank u sir
What Alexis said! v Thankyou!
Who invented the Z-Score?
Take a look at wikipedia edward altman
this video is older than my textbook lol
@statisticsfun okay thank you :D and yes, this is really frustrating haha
super
Thumbs up if You're from Ryerson!
Move a little faster. otherwise greate
@statisticsfun lol you really think so?
I CANT HEAR>
Slow down speed racer
Read faster please we’re not slow
This awful and doesnt in the slightest explain what a z-score is or how it is calculated, i thought my lecturer was bad.
hey don't be mean
K.I.D this is just the meaning of z scores it didnt say that it would explain how it works
I'm a native english speaker as are all the people watching. please talk faster.
Tommy Beckham Thank for your note. This is one of my older videos. Hopefully the pace of the newer videos are more acceptable.
Tommy Beckham that was rude
Tommy Beckham I'm not native english speaker and I like the paste...
+Tommy Beckham Just increase the speed in your settings if you find it slow. Applies to all you tube videos, pretty simple.
+Tommy Beckham Well, I'm not a native english speaker, and I find the pace fine. There are many videoes of speedtalking people trying to explain this in here... or just play it at 2x speed?
How more useless can a math topic get? xD
Very well explained and I appreciate the clear illustrations/visuals