CHAPTER 14
Section 14-3
14-1. a) 1. H0 : τ1 = τ2 = 0
H1 : at least one τi ≠ 0
2. H0 : τ1 = τ2 = τ3 = 0
H1 : at least one τj ≠ 0
b) Analysis of Variance for current
Source DF SS MS F P
glasstyp 1 14450.0 14450.0 273.79 0.000
phostype 2 933.3 466.7 8.84 0.004
glasstyp*phostype 2 133.3 66.7 1.26 0.318
Error 12 633.3 52.8
Total 17 16150.0
Main effects are significant, the interaction is not significant. Glass type 1 and phosphor type 2 lead to the highest mean current (brightness).
c) There appears to be more slightly variability at phosphor type 2 and glass type 2. The normal plot of the residuals shows that the assumption of normality is reasonable.
14-3. a) H0 : τ1 = τ2 = τ3 = 0 H1 : at least one τj ≠ 0
H0 : τ1 = τ2 = τ3 = 0 H1 : at least one τj ≠ 0
Analysis of Variance for life
Source DF SS MS F P
material 2 10683.7 5341.9 7.91 0.002
temperat 2 39118.7 19559.4 28.97 0.000
material*temperat 4 9613.8 2403.4 3.56 0.019
Error 27 18230.7 675.2
Total 35 77647.0
Main factors and interaction are all significant.
b) The mean life for material 2 is the ...
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