 This is data from one of my lab students that I got. And this is the graph that was produced, OK? So let's go ahead. And instead of just looking at this graph, let's build it one more time, OK? So to open up, of course, a new tab, I just press that little thing there. And so what I'm going to do is I'm going to call my column something that makes sense to me, OK? So concentration of NaCl, that makes sense, right? Because that's what was labeled on the bottles of NaCl. And that's one of the axes of our graph. And we're determining the density, of course, by the percentage of NaCl. So the density of our unknown by the percentage of NaCl in these standards, OK? Does everybody understand that that's what we're doing in this lab, right? Everybody get that? Just at least shake your head and entertain me, OK? Cool. OK, so the percent NaCl's were written on the bottles. And they were 1, 5, 10, 15, 20, 25%. Notice I put in the second column density, and I put the units that I have it in, OK? That unequivocally tells me what units you have them, obviously, and makes it less, makes me wonder less about what your data is like. The other thing I want to show you is that all of my data points have the same number of figures, significant figures after the decimal place. So the way to do that, to get them all in the same number after the decimal place, is to go up here to the number box, and you can see there's increased decimal and decreased decimal button. Just click that if you highlight all of them, and you see that it increases or decreases the decimal, depending on what you want to do. I have this to three spaces after the decimal spot. So now what I'm going to do is I'm going to graph it. So I'm going to highlight both columns of numbers. Then I'm going to say Insert, and then I'm going to go over to the graphs here. And then I'm going to push Scatter. And then I'm going to go to the first Scatter plot here. When I do that, you see that it gives me this line here. I like to just delete this thing so I can get a longer axis. And while this chart shows the data, it doesn't label it. So if you were to just show somebody this chart, they'd be like, what does this even mean? This doesn't have any labels I don't understand. So I want you to put a title on this. I want you to put axes labels too. So I'll show you how to do that. So you can see up at the top there's a series of buttons up here. If you click this one here, you can get rid of that again. If you prefer, if you don't, I don't care. And then we can do the chart title. And I would like to call it. So the way you do this is you do the y-axis versus the x-axis. That's how you call a chart. I'm going to call this density, of course, versus concentration of N, A, C, L. So when you put brackets around something, that means concentration of. Then I'm going to come over to the axis here, highlight it, put density, and grams per mil, like that. And then here, I'm going to do just percent N, A, C, L, like that. Pretty straightforward, right? Then I'm sorry to bore those of you who know how to do this already. Then I'm going to, in order to put my trend line on my graph, I'm going to left click on one of the data points. And then I'm going to right click on that same data point. Then I'm going to go down on my menu to add trend line there. Then I'm going to add a linear trend line. It's usually highlighted for you. It's the default. Then I'm going to display my equation on the chart. That's how you get your density of your unknown. And I'm also going to display my r squared value on the chart. That's how you know if your data is good or not, OK? The closer it is to one, the better you got. If it's like 9.5, it's not very good data. If it's 9.9, it's all right data. If it's 9.99, then it's good, OK? You'll see that in the lab, you'll rarely get that you'll get it to be exactly perfect unless you do these experiments a million times and you get your hands to be very good at doing them, OK? So the first time, I expect to get the best lines, OK? But it's good to think about. We're going to close this. And you see it's produced this little box here. You see my graph here. This is actual data from the lab, 9.9955. Again, not the best, but not super bad. And you can see here, we've got an equation that says y equals 0.0072x plus 0.9652. So y, remember, is the density. And x is the percentage of NACL, right? So if you want to figure out what your percentage of NACL is, you know the density of your unknown, right? So you can plug that into your y value here, algebraically rearrange your equation and figure out what your density of your sodium chloride solution is, OK? Is everybody cool with that? So that's essentially what you do. I will post, so obviously I recorded this. I'm not on camera except for just two seconds. So don't be looking for me, so it'll be mostly my voice. But I'm recording the screen too. I'll post this as soon as I get done with class today, OK? And then you guys can have it for next week, OK? Cool?