Question

In: Statistics and Probability

A.) Complete the table calculating ybar, s and In/s B.) Identify the significant factors affecting the response (y)

Run A B C D E F G Y1 Y2

1

- - - - - - - 75.20 73.76
2 - - - + + + + 73.50 77.92
3 - + + - - + + 73.50 77.92
4 - + + + + - - 69.80 67.78
5 + - + - + - + 88.20 81.76
6 + - + + - + - 80.30 82.84
7 + + - - + + - 82.00 86.06
8 + + - + - - + 78.00 83.94

A.) Complete the table calculating ybar, s and In/s

B.) Identify the significant factors affecting the response (y)

C.) Identify significant factors affecting dispersion

D.) What is the predictions equation

Solutions

Expert Solution

Analysis of Variance

Source DF Adj SS Adj MS F-Value P-Value
Model 7 427.445 61.064 6.74 0.008
Linear 7 427.445 61.064 6.74 0.008
A 1 339.665 339.665 37.50 0.000
B 1 13.104 13.104 1.45 0.263
C 1 4.285 4.285 0.47 0.511
D 1 36.966 36.966 4.08 0.078
E 1 0.152 0.152 0.02 0.900
F 1 15.210 15.210 1.68 0.231
G 1 18.063 18.063 1.99 0.196
Error 8 72.460 9.057
Total 15 499.905


Model Summary

S R-sq R-sq(adj) R-sq(pred)
3.00956 85.51% 72.82% 42.02%


Coded Coefficients

Term Effect Coef SE Coef T-Value P-Value VIF
Constant 78.280 0.752 104.04 0.000
A 9.215 4.607 0.752 6.12 0.000 1.00
B -1.810 -0.905 0.752 -1.20 0.263 1.00
C -1.035 -0.518 0.752 -0.69 0.511 1.00
D -3.040 -1.520 0.752 -2.02 0.078 1.00
E 0.195 0.098 0.752 0.13 0.900 1.00
F 1.950 0.975 0.752 1.30 0.231 1.00
G 2.125 1.063 0.752 1.41 0.196 1.00


Regression Equation in Uncoded Units

Y = 78.280 + 4.607 A - 0.905 B - 0.518 C - 1.520 D + 0.098 E + 0.975 F + 1.063 G


Alias Structure (up to order 3)

Factor Name

A A
B B
C C
D D
E E
F F
G G


Aliases

I - ABC - ADE - AFG - BDF - BEG - CDG - CEF
A - BC - DE - FG + BDG + BEF + CDF + CEG
B - AC - DF - EG + ADG + AEF + CDE + CFG
C - AB - DG - EF + ADF + AEG + BDE + BFG
D - AE - BF - CG + ABG + ACF + BCE + EFG
E - AD - BG - CF + ABF + ACG + BCD + DFG
F - AG - BD - CE + ABE + ACD + BCG + DEG
G - AF - BE - CD + ABD + ACE + BCF + DEF

from above graph it is clear that effect A only significant


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