31. Consider again the information in the previous question. Note that the pooled-variance t procedure was used in the analysis. Which one of the following statements is true? (a) The procedure used to obtain the output is a distribution-free procedure (the procedure does not require a normality assumption). (b) An assumption of the procedure is that the sample standard deviations are exactly equal. (c) Since the sample standard deviations are not equal, and the sample sizes are not equal, the pooled-variance & procedure is a very poor method of analysis. (d) The degrees of freedom for the procedure used in the previous question are 29. x (e) Had we carried out a one-way ANOVA on the above data at the same level of significance, our conclusions would have been the same