A study of the properties of metal plate-connected trusses used for roof yielded the following observations on axial-stiffness index (kips/in.) for plate lengths 4, 6, 8, and 10 in: Observations (J) Lengths (1) 1 2 3 5 6 7 4 309.2 409.5 311.0 326.5 316.8 349.8 309.7 6 402.1 347.2 361.0 404.5 331.0 348.9 381.7 8 392.4 366.2 351.0 357.1 409.9 367.3 382.0 10 346.7 452.9 461.4 433.1 410.6 384.2 362.6 1. (2 points) Complete the ANOVA table. Source of Sum of Mean df F Variation Squares(SS) Square(MS) Treatment Error 27419.90 Total 46846.95 2. (1 point) Based on the values that you found in part a, what is the hypotheses that should be considered in this experiment? 3. (1 point) Does variation in plate length have any effect on true average axial stiffness with Explain