Appendix C 



statistical Test 



Statistical test of the similarity between the maximum 

 load-loss rate dependence on packing ratio of the alter- 

 native burning basket method and the horizontally 

 spreading fire. 



The SSE and degrees of freedom, d.f., are given in the 

 following tabulation. The model assumes a second degree 

 polynomial. 



Data set SSE* . . d.f. = n-3 



Verticle burn, SSECV) 9.5600xl0"6 27 



Horizontal burn, SSE(H) 43.6092x10"^ • 20 



Composite, SSE(C) 58.0511x10"^ 50 



*Sum of squared errors 



Forming F value according to Draper and Smith (1966) 



^ (ASSE/Ad.f .) 



(SSE(V+H)/d.f . (V+H)) 



Therefore 



(4.8819xl0"V3) (4.8819) (47) 

 r = = 



(53.1692xl0"^/47) (53.1692)(3) 



F = 1.4385 



Given no difference in the two sets of data the probability of such a value for F, 

 is 0.24. Therefore, we accept the hypothesis that both methods are estimating the same 

 result . 



£r U.S. GOVERNMENT PRINTING OFFICE:1978— 777-095 / 23 



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