【正文】 ot….. 169。The National Graduate School of Quality Management ? 27 Use Minitab to do the Analysis... ?Now click in the Predictor (X): box…. Then click on “Predicted Workload” and hit the select button… This will fill in the “Predictor (X):” data field... ?Both data fields should now be filled…. ?Select OK... 169。The National Graduate School of Quality Management ? 29 Transferring the Analysis... ?Let’s take care of the graph first…. ?Go to Edit…. Copy Graph... 169。The National Graduate School of Quality Management ? 31 Transferring the Analysis... ?Select “Picture (Enhanced Metafile)… This will give you the best graphics with the least amount of trouble. 169。The National Graduate School of Quality Management ? 33 Transferring the Analysis... ?Now we can copy the analysis from the Session window….. ?Highlight the text you want to copy…. ?Select Edit….. Copy….. 169。The National Graduate School of Quality Management ? 35 Transferring the Analysis... ?Well we got our data, but it is a bit large….. ?Reduce the font to 12 and we should be ok….. 169。The National Graduate School of Quality Management ? 37 Graphic Capabilities 169。The National Graduate School of Quality Management ? 39 Pareto Chart.... ?Go to: ?Stat… ?Quality Tools… ?Pareto Chart…. 169。The National Graduate School of Quality Management ? 41 Pareto Chart.... Minitab now pletes our pareto for us ready to be copied and pasted into your PowerPoint presentation…. 169。The National Graduate School of Quality Management ? 43 Histogram.... ?Go to: ?Graph… ?Histogram… 169。The National Graduate School of Quality Management ? 45 Histogram.... Minitab now pletes our histogram for us ready to be copied and pasted into your PowerPoint presentation…. This data does not look like it is very normal…. Let’s use Minitab to test this distribution for normality…... 169。The National Graduate School of Quality Management ? 47 Histogram.... Fill out the screen as follows: ?Select GPA for our Variable…. ?Select Graphs….. 169。The National Graduate School of Quality Management ? 49 Histogram.... Note that now we not only have our Histogram but a number of other descriptive statistics as well…. This is a great summary slide... As for the normality question, note that our P value of .038 rejects the null hypothesis (P.05). So, we conclude with 95% confidence that the data is not normal….. 169。The National Graduate School of Quality Management ? 51 Histogram.... ?Go to: ?Graph… ?Marginal Plot… 169。The National Graduate School of Quality Management ? 53 Histogram.... Note that now we not only have our Histogram but a dot plot of each head data as well... Note that head number 6 seems to be the source of the high readings….. This type of Histogram is called a “Marginal Plot”.. 169。The National Graduate School of Quality Management ? 55 Boxplot.... ?Go to: ?Stat… ?Basic Statistics… ?Display Descriptive Statistics... 169。The National Graduate School of Quality Management ? 57 Boxplot.... ?Select Boxplot of data…. ?Select OK….. ?Select OK again on the next screen... 169。The National Graduate School of Quality Management ? 59 Boxplot.... ?There is another way we can use Boxplots to view the data... ?Go to: ?Graph… ?Boxplot... 169。The National Graduate School of Quality Management ? 61 Boxplot.... Note that now we now have a box plot broken out by each of the various heads.. Note that head number 6 again seems to be the source of the high readings….. 169。The National Graduate School of Quality Management ? 63 Scatter plot.... ?Go to: ?Graph… ?Plot... 169。The National Graduate School of Quality Management ? 65 Scatter plot.... We now have two Scatter plots of the data stacked on top of each other… We can display this better by tiling the graphs…. 169。The National Graduate School of Quality Management ? 67 Scatter plot.... Now we can see both Scatter plots of the data… 169。The National Graduate School of Quality Management ? 69 Scatter Plot.... Fill out the screen as follows: ?Click in the “Graph variables” block ?Highlight all three available data sets… ?Click on the “Select” button... ?Select OK when done... 169。The National Graduate School of Quality Management ? 71 Minitab Statistical Tools 169。The National Graduate School of Quality Management ? 73 Let’s do a process capability study…. Open Minitab and load the file …. 169。The National Graduate School of Quality Management ? 75 Select “Torque” for our single data column... Enter a lower spec of 10 and an upper spec of 30. Then select “OK”…. SETTING UP THE TEST…. 169。The National Graduate School of Quality Management ? 77 HYPOTHESIS TESTING 169。The National Graduate School of Quality Management ? 79 Checking the Data for Normality…. ?It’s important that we check for normality of data samples. ?Let’s see how this works…. ?Go to STAT…. Basic Statistics... Normality Test…. 169。The National Graduate School of Quality Management ? 81 Analyzing the Results ?Since the P value is greater than .05 we can assume the “Before” data is normal ?Now repeat the test for the “After” Data (this is left to the student as a learning exercise..) 169。The National Graduate School of Quality Management ? 83 ?Select both of the available columns (Before and After) to stack.... ?Type in the location where you want the stacked data…. In this example we will use C4…. ?Type in the location where you want the subscripts stored… In this example we will use C3…. ?Select OK…. Check