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UK MA 202 - Winstats Instruction Sheet

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Winstats Instruction SheetI. Installing Winstats on your ComputerA. Go to the Peanut Software homepage. Either go directly tohttp://math.exeter.edu/rparris/default.htmlor Google “Peanut Software.”B. Click Winstats.C. Click Winstats on the next page.D. Save the file.E. Locate the file you just saved.F. Unzip the file ws32z.exe. By default, the unzipped file was placed in the folderC:\Peanut on my computer. The unzipped file will be associated with the icon.1G. Delete ws32z.exe. You do not need it.II. Getting Started with WinstatsA. Opening Winstats1. Double click on the Winstats icon.2. Select “Window → 1-var data. . .” This will cause Winstats to create somerandom data entries. The amount of data created is also randomized. If youcannot see all of the data, this will be indicated at the bottom of the screen.In the example below, there are 17 rows and 9 columns of data. You can usethe scroll bars to view the rest of the data.B. Entering DataTypically, students will need to input their own data into the program. Supposewe wish to analyze the grades shown below.2NAME Exam 1 Exam 2 Exam3 Exam 4Andy 89 83 100 94Barney 76 72 83 75Bee 91.5 96.9 89 106Floyd 44 41 52 64Opie 91.5 73 99 97Helen 68.5 84.5 92.5 99Thelma Lou 55 56 44 60Ernest T. 46 40 48.5 59Clara 83 87.5 82.5 97Goober 76.5 55 64 87Gomer 78.9 66 95 79Otis 87.5 91 75 88Jud 50.5 58 60 65Howard 85.5 68 91 86Charlene 85 80 72 84Chelsea 84 98 101 105Briscoe 70.5 50 65 52Ellie 94 85 72 72There are at least two ways to do this.1. Enter the data by hand — I think this is the most tedious way to do this, soI don’t suggest it.a. Change the dimensions of the data. Go to Edit → Dimensions... Enter18 as the number of rows and 4 as the number of columns since there are18 students and 4 test scores for each student. As of May 2004, you cannotenter text data into Winstats, therefore you should not include a columnfor the names.b. Change each piece of data, by clicking on the appropriate data item, chang-ing the data accordingly, and pressing Enter.2. Import the data from a text file.a. Save the data in a text file. (You can use Notepad, WordPad, or a similartext editor. I have had more luck with Notepad than with WordPadbecause Notepad is more basic than Word Pad.) You should not includea column for the names. As of May 2004, you cannot enter text data intoWinstats. If you try to include text in this file, it is likely that Winstatswill try to treat some of it as column headers and the rest will be ignored. Ithink it is best to leave all text out of the file. I tried to include the columnlabels “Exam 1,” “Exam 2,” “Exam 3,” and “Exam 4,” in the text file butWinstats interpreted 1, 2, 3, and 4 as data items. Consequently I think itis best to include only data in your text file. My text file is shown below.I will include this file with the documentation.3b. Go to File → Text in. . . Double click on the text file containingyour data.C. Changing Column Headings1. Make sure you can see row 1 of the data.2. Click on the appropriate column label.3. Enter the new label,4. Press Enter.After you do this, your Winstats window should look like the one shown below.4D. Changing the Data FormatAt the moment, all of my data is displayed with five decimal places, but I onlyneed to see one decimal place with this data. To change this:1. Go to Edit → Format. . .2. Change the number of decimal places from 5 to 1.3. Click ok.III. Using Winstats to Calculate One-variable StatisticsA. To see the the one-variable statistics for all of the data go to Stats → Overall.. . You should see the following screen.Notice that these statistics include all 72 test scores. It is unlikely that these arethe statistics you desire since each column represents a different exam.B. To see the one-variable statistics for a single column of the data go to View →Only column 1. . . Suppose we want to examine the scores for Exam 2, thenwe will need to enter 2 and click ok. Notice that the scores in column 2 arenow red. These are the scores under consideration. Once again. go to Stats →Overall. . . You should now be viewing the statistics for Exam 2.5IV. Using Winstats to Draw GraphsA. Histograms1. Go to Stats → Histogram → Histogram. . . You should see a his-togram that is similar to the one shown below. It may differ slightly, dependingon the interval used.2. Before drawing the histogram, Winstats will determine an interval that con-tains all of the data. This interval may or may not be appropriate for thedata. For example, the interval in the histogram above contains negativescores. Clearly this is not appropriate. Let’s change the interval so that it6ranges from 0 to 110. To do this, go to Stats → Histogram → Interval.. . Change the low to 0 and the high to 110. Click ok. (See the histogrambelow.)3. To see the heights of the bars, go to Edit within the Histogram window. Thengo to Bar labels → Top → Frequency. (See the histogram below.)4. To see the labels on the x-axis go to Edit within the Histogram window. Thengo to Bar labels → Bottom → Division. (See the histogram below.)7B. Other GraphsYou can obtain stem and leaf plots and box and whiskers plots in a similar manner.V. Including Graphs in Other DocumentsTo include a graph in another document go to File → Copy to clipboard. Youcan then paste the graph into another document, such as a Word document. If youuse LATEX, you could paste the graph into a document and convert it to an acceptablepicture format such as an .eps file.VI. Calculating Probabilities with WinstatsA. The Normal Distribution1. Go to the main Winstats window. Choose Window → Probability → Normal...You should see a normal distribution like the one below.82. To calculate the probability P(−.3 ≤ x ≤ 1.5), go to Calc → Probabilities.Enter −.3 for “low x” and 1.5 for “high x.” Click probability. You should seethat P(−.3 ≤ x ≤ 1.5) ≈ .55110. Also, the area under the normal curve fromx = −.3 to x = 1.5 should now be shaded.3. You can change the parameters of the distribution by going to Edit → Parameters...B. The Binomial Distribution1. Go to the main Winstats window. Choose Window → Probability → Binomial...You should see a binomial distribution like the one below.92. To see a normal distribution with the same mean and standard deviation goto Edit → Normal overlay. The area under the normal curve and the areaof the histogram will be equal.3. You can change the probability


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UK MA 202 - Winstats Instruction Sheet

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