factors:). Use the Designs submenu to specify a full factorial design with two repli- cates, blocked on replicates. Use the Factors submenu to specify the variable names (Length, Width, and Clip exactly) and their low and high physical levels. (b) Use Stat> DOE> Display Design> Coded units to display the experiment design in coded units. Then use the correlate.mac macro (type %correlate c5-c7 at the command line) to create the correlation matrix. Inspect the matrix for correlations between terms in the model. Return the data display back to uncoded/physical units. (c) Make sure that your run matrix is displayed in uncoded/physical units. Copy the Paper Helicopter Simulation.mtb macro file to your MINITAB Macros Macros Vrx\ folder and use Tools> Run an Exec (V18) or File> Run an Exec (V19) to run the macro. The macro should create simulated flight time data in the c8 (Time) column. (d) Use Stat> DOE> Factorial> Analyze Factorial Design to analyze the Time response. Use the Terms submenu to specify terms up through order 3 and include a term for blocks in the model. Use the Graphs submenu to enable the residuals four- in-one plot and one or more of the effect plots, e.g. Pareto. Check the model residuals to make sure that they meet the requirements of the analysis method. (e) Use Stat> DOE> Factorial> Factorial Plots to create main effect and interaction plots. Interpret the plots. (f) Use Occam's razor to refine the model from the Terms submenu. (g) Use Stat> DOE> Factorial> Response Optimizer to determine the geometry of the paper helicopter that will have maximum flight time.

Fig: 1