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Set of data had sample man or 7840 @roresse and percentuqe_ dd ; sample standard deviation for this set 8.3. What the cocfficient of variatilon_ (CV) Round Uor anst...

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Set of data had sample man or 7840 @roresse and percentuqe_ dd ; sample standard deviation for this set 8.3. What the cocfficient of variatilon_ (CV) Round Uor anstrer decima plces Your AnsterAnsweSave

set of data had sample man or 7840 @roresse and percentuqe_ dd ; sample standard deviation for this set 8.3. What the cocfficient of variatilon_ (CV) Round Uor anstrer decima plces Your Anster Answe Save



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The given values represent data for a sample. Find the variance and the standard deviation based on this sample.
12.1, 33.3, 45.5, 60.1, 94.2, 22.2

All right, you guys. So it wants us to find here the sample variance and the sample standard deviation. So that's what we're going to do. Okay, so for this one guys, you could go back and look at your text to figure how to do this by hand by maybe a really easy trick. I'm opening a google sheet right now, you can do the same thing on an Excel sheet if you like. If you prefer to use Microsoft word, but there's not a google sheet. And so I'm going to show you how to do it very, very quickly. So this ask for a sample, which means I need to find the sample variance first. Okay, so here's how you do that first. You just click the equals button on your keyboard, press the equals button. Then you're going to type in the letters V A are okay. And now let's say I pipe in VR and indicate the variance. I then do open parentheses and I'm going to use my cursor to highlight all of these and now I'm just going to press enter And it's 36. That's simple. Now, same insanity aviation is very similar. Again, you start with an equal sign and that's telling the sheet that you want to calculate something. And then for standard deviations you're gonna I'm gonna start typing an S. Then the letter T. Then the up there it is S. T. Dev right there in that standard deviation. And again, it's going to open the premises for me. This time I'm going to select all the data points I hit enter and at six, a great way to check this. Is this the standard deviation squared should be the variance six squared six times six is 36. So it's looking good.

All right guys, so for this one, they do want us to find a sample variance as well as a sample standard deviation according to the questions. Let's go and get started. I'm going to go and use a google sheet. I went ahead and typed in all the data points into my google sheet. If you'd like to do it by hand, go for it, you just have to read your text book. Um So here's what I'm gonna do 1st. 1st I'm gonna type the equal sign, Okay, And that equal sign will tell my google sheet that I wanted to calculate something and now I need the variance. Okay, so I'm going to type in V A are there? It is, this is the variant specifically for a sample, which is what I want. So I click on that and it opens a parentheses. That means it wants me to highlight everything I want the variance for in this case, all the numbers. Then I go on my keyboard, I hit enter and there we go. Alright, the same thing can be done for standard deviation. So let's go and do that. So first I hit the equal sign on my keyboard, I'm gonna start typing in standard deviation. Where to go? It's S. T dev. There it is. Okay, cool, S T dev standard deviation. Okay, so I'm going to click on that again, I will highlight all the data points and then hit enter and there's my standard deviation. Um Okay, so a great way to check to see if it's correct, is your standard deviation squared should be your variance. And so what's 14 times 14? Let's ask the spreadsheet, what 14 times 14 is? It's 1 96 awesome. Okay, it looks like we got it right.

All right guys, so in this one it does want us to find a sample variance and the standard deviation. So I'm gonna show you really quick trick to use on Google sheets, you can use this on Excel two, or you can do this by hand. If you wanna do it by hand, you can reference your textbook. But for this one, here's what we're going to do. First, going to calculate the sample variance, the way I do that is this already typed in all the Um numbers there, I'm going to type in the sample variance. So, first I'm going to do VAR right there, that VR is for sample variance, I can click on that and there we go, and then I need to highlight the data points. I want to calculate the variance floor there it is. Now, I'm going to press enter on my keyboard and I get a variance of 100. Okay, let's say I wanted to do the standard deviation next. I think it does want me to. Standard deviation next. So do standard deviation. You're going to type the equal sign and it's going to be S T. And then death S. T dev. There it is. S T dev. I click on that same thing, I then use my cursor to highlight all the data points I'd like to calculate, And then I hit enter and it's 10. A great way to check to see if these are correct. Your variants should the square root of your variants should be the standard deviation squared, 100 is 10, so it looks like I'm good.

Okay, So for number 34 this is one of those answers May very kind of things in there several different ways. You can go about this and choose this, and it's actually pretty straightforward. So you're trying to figure out a Senate aviation variants that both equal zero. So if you're variants equals zero, the square root of zero is zero. So our main focus is going to be trying to be able to figure out how to work backwards and get a variance that's gonna lead to a zero. And it's actually pretty straightforward. So I'm going to do one example. But once you use that you see my table, you can come up with your own relatively straightforward. So basically, you would need to have a list of the same numbers. That is one way you can go about this. So what I mean by that is say, I want a list of lives. Well, here's how that would work. If I get a list of five, I need a have five of those in my list because what will then end up happening is if I go and I get my bar, I dio ah five plus five plus five plus five is 25 divided five. You know it's five. We'll hear a call from previous problems to get your variants. You take all the numbers in your list and you're subtracting them. So five minus the mean is going to get me zero. And that's what zero squared is still zero. So we've made our goal. So this would also have worked because if I keep going and keep going, I'm gonna get 0.0 and we all know that still zero, So that is going to be awesome. So if I did a list of four force that could work as well. And so basically, you just do however many numbers of whatever number you pick, so you pick 10 you'd have 10 tens in your list, and that will still get you your Senate deviation and variation, both being equal to zero


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