Samples from a Normal Distribution | Statistics Tutorial #4 | MarinStatsLectures
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- Опубликовано: 3 окт 2024
- Samples From a Normal Distribution: What does normal in statistics look like? How do samples in statistics vary from population? (with examples and web simulations)
Web simulation tool for Sampling (bit.ly/2FhJ3xn)
"Understanding Normal Sample" R-Script: (bit.ly/2rOfgEJ)
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In this video we learn about how samples behave. First, we will use R programming language to run simulations by drawing a sample from a normal distribution and create histograms, and calculate mean and standard deviations for it. We will also use a very cool web visualization tool to draw various samples of different sizes from a normal distribution, create histograms, and calculate mean and standard deviations for it.
Often, a sample which we might think as "skewed" or "not normal" actually IS normal at the population level
We will take samples from a Normally distributed population, and look at the shapes of the histograms that we will end up with. This will help us to see that "normal data doesn't always look so normal"
This is important, because many statistical methods rely on an assumption of normality, and so we need to have a better understanding of "how samples behave", and not be so quick to label data as skewed/non-normal.
This will lead us into a discussion of a Sampling Distribution: the theoretical set of "all possible" sample means we may end up with when taking a sample.
First we must learn to understand how samples behave, and what sorts of estimates may show up in data. Once we understand this, we can then do "statistical inference", and use our sample to make statements or generalizations back to the population.
This video is the step in understanding how samples vary from the true or population value.
◼︎ Table of Content
0:00:49 Using R Programming Software to run simulations by drawing a sample from a normal distribution create histograms, and calculate mean and standard deviations
0:04:01 Using a web visualization tool to draw various samples of different sizes from a normal distribution, create histograms, and calculate mean and standard deviations
►► Watch More:
►Normal Distribution Concept: • Normal Distribution, ...
►Normal Distribution in R: • Normal Distribution, Z...
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Thanks for watching! Have fun and remember that statistics is almost as beautiful as a unicorn!
In statistical analysis, we use a sample to make statements about a population; but the sample won't always look exactly like the population, so we need to learn a bit about how different might it look so that we can incorporate this into our procedure for making statements about a population which we call statistical inference; Find the R-Script: (bit.ly/2rOfgEJ) and Web-Visualization tool (bit.ly/2FhJ3xn) to practice more! If you like to support us, you can Donate bit.ly/2CWxnP2 or Share our videos with others
one of the best statistics course i seen in internet
Sir you made statistics very easy for me, very usefull course, Even in paid courses we cannot see such kind of explanation,
Thanks alot for making it so simple! was looking for this but all I could see were advanced ways of doing it using for-loops!
Thank you for making these videos, and explaining the concepts so well!
you're welcome!
Hi Mike, thanks for your videos and teaching.
And your son's voice is cute and I love it.
Again, thank you very much for these statistics courses. It very helpful and the teaching is simple and clear.
I was watching your lectures, I watched 'em all untill I got this to this video. Should I learn the basics of R language before learning statistics? What would you suggest?
And thank you your lectures are amazing and helping me a lot!
He keeps saying in the videos that he wants us to understand the concepts before finding a tool (R or Python) which can make the job easier. If your are fairly new in the field, I will advice you to focus on understanding the Statistical concepts he explains and later when you have a good understand and if you want to pursue a career in the field or something like that it will help to learn R to save time and quickly get to the results.
Dear Mike Marin, thank you for this video. Please, can you give us a link to that R script for us to practice?
Hi, i am going to re-create it and upload it this evening (i can't find the original at the moment)
You can now download the "Understanding Normal Sample" R-Script: (bit.ly/2rOfgEJ), and find the Web-Visualization tool (bit.ly/2FhJ3xn)
Thank yoy
Pls remove the subtitles. They are redundant for english speakers and just take our time to remove it each time we watch your videos. Thanks.
Just change your settings to not show closed captions
@@marinstatlectures oh,ok. I didn't know there was such a setting. I was doing it each one manually every video. Thank you!