In an experiment to assess the effect of the angle of pull on the force required to cause separation in electrical connectors, four different angles (factor A) were used, and each of a sample of five connectors (factor B) was pulled once at each angle ("A Mixed Model Factorial Experiment in Testing Electrical Connectors," Industrial Quality Control, 1960: 12-16). The data appears in the accompanying table.

Does the data suggest that true average separation force is affected by the angle of pull? State and test the appropriate hypotheses at level .01 by first constructing an ANOVA table (SST = 396.13, SSA = 58.16, and SSB = 246.97).

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0° 45.3 42.2 39.6 36.8 45.8 2 44. 44.1 38.4 38.0 47.2 4° 42.7 42.7 42.64.48.9 6 43.5 45.8 47.9 37.9 56.4 [표