Description
x-2y+2z=-11
2x+5y-7z=36
X-y+z=-5
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take the equations as a,b and c
x-2y+2z=-11------------a
2x+5y-7z=36---------b
X-y+z=-5-----------c
2x-2y+2z =-10-----d
a-d
x-2y+2z - (2x-2y+2z) = -11-(-10)
both y and z cancells
-x=-1
x=1
c*7
7x-7y+7z=-35------e
e+b
7x-7y+7z + (2x+5y-7z) =-35+36
9x-2y =1
you know x =1
2y = 1-9
y=4
substitute x and y to equation c
1-4+z = -5
z= -2
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b. 10.5% csa? 6. Rounded to the nearest month, how long will it take an investment to quadruple if it earns:
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Write down the names of 10 quantitative X variables having the highest correlations with sales. From the correlations worksheet, move to the data worksheet. Select the following columns: sales, plus the 10 quantitative X variables you wrote down, plus comtype1, comptype2, comptype7 (here, you could include up to three more dummy variables, but they are likely to be statistically not significant, so you can save some work - see 2. above). Copy these onto a blank worksheet. Make sure there are no blank columns in within the data range in the new worksheet. Note: To prevent unexpected changes in copying data when formulas are involved, use Paste Special with Values selected when pasting data into a new worksheet. Use Regression under Data Analysis to obtain the regression output table for sales using the variables in the columns you had selected, making sure that Labels and New Worksheet Ply checkboxes are checked, and leave the other boxes unchecked. 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Also obtain a histogram of Residuals.Use the final regression equation you found in the last step to predict sales at the two sites under consideration. You have just completed all necessary computer work for your project report. Now you have to write a report to present your answers to the case questions (see pages 433-434 of your textbook), and the reasons for those answers. In terms of physical organization, a reasonable format for the report is described below. Content and Format of the Project Report Cover page Include the report title, your name, course, section, facilitator, and date. Go to a new page, and use the following subsection headings for the report. Introduction One paragraph (two at most) describing the subject and context of the project. Data One or two paragraphs describing the data in plain English (number of variables, number of observations, units for data values, etc.) Results and Discussion This is the main body of the report. It is where you will describe what you have done, what you found, and answer the case questions with the reasons for your answers. These reasons should be based on the analytical work you have done using Excel. Depending on how concisely you write and how many tables and graphs you include, this page could be 3-4 pages long. Conclusion One or two paragraphs discussing any remaining issues (e.g. shortcomings and possible improvements of the analyses in the report). In the Results and Discussion section, you should include a few informative tables or graphs derived from your computer analyses. DO NOT include anything that is not absolutely necessary. DO NOT include entire worksheets form Excel, but only the parts you need. For example, do not include the entire correlation matrix found in step 4 above, but you can make a small table to show the 10 variables having the highest correlations with sales. You should include the scatterplot of sales against comtype, relevant portion of the final regression output table, the final regression equation, and the two residual graphs you obtained in step 8. Please keep the total length of the report under 8 printed pages (5 to 6 pages should be sufficient in most cases). Please submit you report as a Word
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