Starting Minitab: Minitab operates in a windows environment which is available on the computers in VZN 142 & 152, Lubbers Hall, second floor, and other locations. The program can be accessed by selecting (click on, using left mouse button), in order, Start Þ Academic Þ Mathematics Þ Minitab (with logo). After a short wait Minitab will be operating.
Getting Data from our Text off the Hope system: Pull down the File menu located in the upper left portion of the screen to Open Worksheet. In the Files of type: box use the down arrow to find Minitab Portable [*.mtp]. Type w: in the File name: box and hit Enter on your keyboard. You should now see a number of folders displayed. Double click on the Math folder and then on the Math 210 Data folder. Double click on the chapter for which you want data. The files within this chapter will then be listed. The Math 210 Data files have prefixes of eg for example, ex for exercise, and tab for table. Double click on the file of your choice. You may change the column headings if desired.
Getting Data from our Text off the CD: Pull down the File menu located in the upper left portion of the screen to Open Worksheet. In the Look in: box at the top of the window find the Bps 2 listing inside your CD driver. Double click on Datasets then PC DATASETS then Minitab. Again use the down arrow to find Minitab Portable [*.mtp] in the Files of type: box. You should now see the chapter folders. Double click on the chapter for which you want data. The files within this chapter will then be listed with the same prefixes as above.
Saving a Worksheet or Project: You must save to a disk in the a-drive. Make sure you have a disk in the a-drive. Next, pull down the File menu to Save Current Worksheet As..., or Save Project As ... and open up the a-drive. (Save in: 3[1/2] Floppy (A).) We are using Release 13 so Save as type: Minitab. After File name: type in a file name and then click on OK to save it to your disk.
Your own data: Minitab can be used to analyze your data. Either input your data from the keyboard, your disk, or copy from Internet. If you input data from the keyboard, you may save it for future use by inserting a disk into the a-drive and saving it on the disk.
Printing a Window: To print an active window from Minitab, pull down the File menu to Print Window... or click on the Print Icon. Answer the questions asked and select OK.
Exiting Minitab: To exit Minitab, pull down the File menu to Exit. Or, you may click the x in the upper right hand corner of the screen.
Graphing and Calculating Statistics
Constructing a Histogram: Select Graph Þ Histogram. Choose the data you want to graph. Either double click on the data name OR click on the data name and then on Select. By choosing OK, Minitab will graph the data in its default mode. You may want to change the number of classes, midpoints, cutpoints, widths or type of histogram. To do this, select the Options... button on this window. This will allow you to change the horizontal axis from displaying midpoints to cutpoints. It will also allow you to specify your smallest and largest cutpoints (class boundaries), as well as the width of the intervals. For discrete data, use MidPoint for Type of Intervals and for the Midpoint/cutpoint positions: specify min:max/1, where min and max are integers selected by you. For continuous data, use CutPoint for Type of Intervals. In Midpoint/cutpoint positions: type in - smallest:largest/width, where smallest and largest are the smallest and largest class boundaries and width is the class width. Three types of histograms can be drawn.
Constructing a Boxplot: To construct a boxplot, pull down the Graph menu to Boxplot. Choose the variable you want graphed and put it in the Y-column. Press the OK button to see the graph. Under Options you can have the boxplots plot horizontally rather than vertically. When constructing more than one boxplot the data can either be stacked or unstacked. When it is stacked, put categorical data variable (1's and 2's, e.g.) in the X-column and the variable you want graphed in the Y-column. For unstacked data, put each variable you want graphed in separate cells in the Y-column and then click on Frame Þ Multiple Graphs Þ Overlay graphs on the same page.
Constructing a Scatterplot: Select Graph Þ Plot. Input your X and Y variables and click on OK.
Editing a Histogram, Boxplot, or Scatterplot: To add, delete, or move text on a histogram, boxplot or scatterplot, select Editor from the top and then select Edit. You should now be able to block things and Delete them under Edit. You can also add text by clicking on the T at the upper right of the window.
Constructing a Stemplot: To construct a stemplot (Stem-and-Leaf Diagram), select Stat Þ EDA Þ Stem-and-Leaf.... Choose the variables you want graphed and hit the OK button.
Copy to Microsoft Word: Graphs and Minitab output (highlight, cut, and paste) can be copied into a Microsoft Word document. For graphs, put cursor on the graph, click the right mouse button and copy graph. Position the cursor in your Word document and Paste or use CTRL-V.
Calculating Basic Statistics: To calculate some basic statistics, select Stat Þ Basic Statistics Þ Descriptive Statistics.... Choose the variables you want. Click on OK and Minitab will calculate the sample size, mean, median, trimmed mean, standard deviation, standard error, minimum value, maximum value, first quartile, and third quartile.
Correlation and Regression: To calculate the correlation coefficient, select Stat Þ Basic Statistics Þ Correlation. Input your two variables and click on OK. To calculate the linear regression equation, select Stat Þ Regression Þ Regression. Input the dependent (Y) variable as the response and the independent (X) as the predictor. You may have to scroll up the session window to view the result. An easy way to find both the correlation coefficient, the regression equation, a scatterplot, and a graph of the regression equation is to select Stat Þ Regression Þ Fitted Line Plot. Input the response (Y) and predictor (X) variables and click on OK.
Significance Tests and Confidence Intervals for Means: To perform a significance test or construct a confidence interval for one or two means, select Stat Þ Basic Statistics and then either 1 sample t or 2 sample t. On the next window you can choose a confidence interval (and the confidence level) or a significance test (along with what you are testing against and the direction of the test). When doing a matched pairs test you may want to subtract one column of numbers from another. You do this in the session window. Type Subtract c1 c2 c3 to subtract column 1 from column 2 and place the results in column 3. Or, suppose that c1, c2, c3 are named x, y, d, respectively. Select Calc Þ Calculator, place d in the Store result in variable: box and then type in your Expression: in the box. Double click on c1 x to move x into the box, then type in a minus sign, -, and then double click on c2 - y followed by OK. Column c3 will now hold all the differences, c1 - c2.
Chi-Square Test: To perform a chi-square test of independence, select Stat Þ Tables Þ Chisquare Test. Input the columns of your table and click on OK.
ANOVA: To perform an analysis of variance, select Stat Þ ANOVA Þ either oneway or oneway (unstacked). If the data are stacked, input the variable that you want to test as the response and the categorical data (1's and 2's, e.g.) as the factor. If the data are unstacked, input the response variables you want to test and click on OK.