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# HW9 - STAT 350 Homework#9 SOLUTION CORRECTED 1 Use the data...

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STAT 350 – Homework #9 SOLUTION CORRECTED 1. Use the data set given in the Text Exercise 3.1 to answers the questions below (you are not being asked to answer the questions in this text exercises, just to use the data set). I recommend use SAS to do the regression analysis (please give the relevant SAS output along with your answer). I recommend you NOT use Excel, as you will be expected to use SAS output for the final exam. Scatterplots should be done in Excel and should meet the conditions for a "nice" scatterplot as defined in Lab #8. SAS Output The SAS System 14:35 Saturday, April 12, 2008 1 The REG Procedure Model: MODEL1 Dependent Variable: ratio Number of Observations Read 24 Number of Observations Used 24 Analysis of Variance Sum of Mean Source DF Squares Square F Value Pr > F Model 1 4.47574 4.47574 18.10 0.0003 Error 22 5.43955 0.24725 Corrected Total 23 9.91530 Root MSE 0.49724 R-Square 0.4514 Dependent Mean 1.67042 Adj R-Sq 0.4265 Coeff Var 29.76771 Parameter Estimates Parameter Standard Variable DF Estimate Error t Value Pr > |t| Intercept 1 -15.24497 3.97705 -3.83 0.0009 temp 1 0.09424 0.02215 4.25 0.0003

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a. Using Excel, make a "nice" scatterplot of efficiency ratio (on the y axis) against tank temperature (on the x axis) y = 0.0942x - 15.245 R 2 = 0.4514 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 168 170 172 174 176 178 180 182 184 186 188 190 b. Find the least squares regression equation to predict efficiency ratio from tank temperature. ˆ 15.24497 0.09424 y =− + x ) c. Find the correlation between efficiency ratio and tank temperature.
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HW9 - STAT 350 Homework#9 SOLUTION CORRECTED 1 Use the data...

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