One-factor ANOVA can be used to answer which of the following questions? Multiple select question. Are the observed defect counts at four manufacturing plants due to poor raw materials or due to poorly trained employees? Are the observed differences between four manufacturing plants' defect counts due to chance or too great to be attributed to chance? Are the average overtime hours observed at a specific manufacturing plant greater than the company benchmark? Are the observed differences in overtime hours at four different manufacturing plants due to chance or too great to be attributed to chance