And if your stats teacher is boring or just doesn't want to help you learn stats, go to, where you can learn more about accessing our lecture videos or provide feedback on what you'd like to see. Be sure to leave your comments below and let us know how good a job we did or how we can improve. Nice work!Īnd that's how we do it at Aspire Mountain Academy. If we were to take a line down the middle, then each half should be a mirror image of the other half, and that's not what we see here. It must be Answer option D: "No, it is not symmetric." And that is true that the distribution that we have here is not symmetric. So yeah, we're not going to select Answer option C. There's an obvious maximum right here on the left side of her distribution. So Answer option B is not going to be correct.Īnswer option C is not correct because it says the distribution has no obvious maximum. And we've got quite a bit of variation among the different classes. Uniform means that all of these bars would be coming up to about the same height or level, and that's not what we have here. It says that the distribution is approximately uniform. So looking at our answer options, Answer option A is not going to be correct because we don't conform to that characteristic bell shape that a normal distribution should have.Īnswer option B is not going to be correct. Excellent! Part 2Īnd now the last part of this problem asks, "Do the data appear to have a distribution that is approximately normal?" Well, a normal distribution starts out small, comes up to a high point in the middle, and then comes back down again. If I look at Answer option B, notice how that same point actually goes up closer to 10, so it's well over 5. So this bar that comes up here near the end is a 4, which is just under 5, and here we've got 5 and you bring that over and, yeah, you could say that that that might be the case. It starts at a high point and comes down and then comes back up a little bit. Distinguishing between Answer options A and B - so if I look here at Answer option A - I'll blow that up just a little bit - notice here how the graph goes. So we're not going to choose Answer options C. But the one that comes from our summary information is here on the left. So looking at my three answer options here, Answer option C is not going to be right because the high part of the graph is here on the right. Hit compute!, and look! Now I've got something that looks more like what I'm asked to choose in my answer options. I wish this was selected by default, but it's not. And then I always like checking this box for Value above bar. Categories are going to be the class counts are going to be the frequency. So what we want to do is go to Graph -> Bar plot -> With Summary so that we can make our graphical representation of the summary Information. And that's why the histogram feature doesn't work, because the histogram feature assumes that this information is actual data and not summary information. This is a summary of the data that you actually have, not the data itself. What you have here is a frequency distribution table. The problem with that is that this function in StatCrunch assumes that the numbers you have here in the data table are actual data values, and they're not. Most people, when they want to make a histogram, they're going to go up to Graph -> Histogram. Alright, so now we've got the information here into StatCrunch. There's the first column, and now we put in the second column for the frequency counts. And it doesn't take too long once you get going with this you just gotta keep punching those buttons on your keyboard, and away you'll go with this. And if you look and see that there's actually a pattern going on here, that actually helps you to input the information in just a little bit more quickly. And I'm going to pop that out here so we can take a look at our problem and see everything that's going on just a little bit better.Īlright, so here in StatCrunch, I'm going to enter in this first column here for the classes. To do this, we're going to open up our own separate copy here of StatCrunch. So what we're going to have to do is input this information in manually. Notice that we don't have any icon to click on to dump this information directly into StatCrunch. So we need to get this information here in the table into StatCrunch. OK, the first part of this problem asks us to construct a histogram.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |