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Standard Error

Added Sep 21, 2015 •

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hi sister anything in this area I'm going to talk about Standard air Standard air is one of my favorite statistics in the reason why isn't it shows you how good your data is and then let me show you what I'm talking about so let's say I collect two data sets to this set alarm in this is Dad affect you if you're the data you would say well the front over here seems to show more patricians going to have more data and it doesn't seem to be red hot it but it's already graphic data so due to data that if I were simply didn't create a graph showing the mean or the average of a data go in them 12in terrified a bar graph would look like this for both data that one and got a hit to the bar graph if you're using it to represent a lot of data error bars on it so how you figure out what the standard error is how do you make a standard error bars Volusia so basically all work through to a man I'll ask you to work through that at that one with the answer down in the description down below and so to figure out Saturday or the equation is really basically all they do is they take the standard deviation and we divided by the square root of the sample size why is that important will what is standard deviation measure is going to measure the spreader how far the data is spread out and so if you have a lot of spread then you're going to have a large standard music for the sample sizes how much data are you collecting if you collect a lot of data and we're going have a large number here decrease my Standard air like I have not much data at all that's going to increase my Standard air deviation if you don't know how to calculate dictionary what it is how to measure spread your going to go want to go watch a video Until here's a little link I'll put to a video I made on standard deviation please Play click here or I'll put a link to the standard deviation in the video description down below but you want to see you're at how to do standard deviation I tell you how to do it by hand use a spreadsheet to calculate standard deviation very very quickly and sample size is going to be the number of you do are the number of data point that you collect in so pretty look at that a tattoo there are 10 numbers over here so that means I going to have a sample size mine let me switch over to the spreadsheet and show you how to do this out the right here I'm in Excel this is going to be badass at 2 again how to do that one and then here's data set one going to do it cuz I've got to tell him right here I'm going to personal calculate the average of that or the meaning of that eagle mean for the median National show up and that's because that you don't use the word mean they're going to use the word avarice going to put an equal sign then I'm going to write an average and then parenthesis and not going to tell Excel which kind of a dad I want to get the average from the in parentheses in Italy calculate for me that is well here's a quick little trip so I've done the average for this Colin if I select this app microphone here watch out changes the changes from that to that until I can click it now and then just dragged out over here and fix yellow smart enough figure out the average is that you want the average of this calling you can see the average is going to be the same show you how to do the standard deviation if you did that by hand Forever Until it's really important that you use either calculator or spreadsheet to do this I mean hit people and then I can start typing STD disease going to be standard and hit a parentheses and I'm going to select the data and then I'm going to get in parentheses and there's my standard deviation now if we're to compare that to the sander Dallas at 1 so can we do that trick I'm going to slice it move it over here you can see the data that one has a much larger standard deviation that means it's going to have a greater red in the back but I'm going to figure out the standard error this first one for this is .85 until how do I I'm going to remember these numbers here and then switch back figure it out so let me write down the things that I need to know tell my ex bar or my meeting I said is going to be 12 the end or the sample movies that are going to be 10 in Dallas at 2 cuz I have 10 values over here on the right and then the standard deviation that I just calculated is going to be you tried about how do I figure out the standard DVR Standard air for the standard error of the mean which is .8 - 6 divided by the square root of the simplified square root of sample size is going to be equal to .826 divided by the square root of 10 the need my calculator right here matter going to be 3.6 and then I have to figure out something write that down so that 3.16 and then if I .82  / 3.1 trailer I get point to hook 12.2 on my inner ear or standard error of the center of the data set 1 remember and data alarm  two values 9 and 15 and says he want to figure out the Standard air those until you make sure your not right you can do that and I'll put the values down below but what is this song mean well let me show you why this is super important so if we go over here and look at our grass again so I just update on standard error of data to the what that mean is that to my mean is 12 into the average is well I can add an error bar on the top Dominican add an error on the bottom and my standard is going to be weak driving to the one another word that goes from 12 up to 12.261 212 down to 12 - 1261 going to have an error bar on each side will you do go figure out that one that one you're going to have a month order standard deviation you're going to have a smaller sample size and so I would imagine you're going to have a pretty big error bar since her what you mean about that is the barber now the standard error bars is going to show me 10 of the story it's going to tell me about the data behind me or the data behind the average Standard air pretty straightforward simple you probably going to need a spreadsheet to do it and I hope that was hell

Uploaded by E. Bellah.

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Standard Error

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