Which of the following statements is NOT FALSE? 0 a. The blocking serves to eliminate noise that otherwise would affect the comparison between treatments. 0 b. In general, the error sum of squares in one way ANOVA is smaller than the block version of it. 0 c. The randomized block design need more number of observations than the completely randomized design. 0 d. In randomized block design, if the null hypothesis for the block effects is not rejected, then the conclusion is that the block effects are not equal. If you want to examine differences in the slopes of the regression line for 2 given groups, what type of variable will you use? 0 a. Indicator variable 0 b. Dependent variable 0 c. Interaction variable 0 d. Intercept 0 e. None