Which of the following statements about one-way ANOVA are true? There may be more than one correct statement; check all that are true. a) The p-value is the area to the right of the observed value of the test statistic, under an F distribution with the appropriate degrees of freedom. b) One assumption of the one-way ANOVA F test is that the samples all have the same mean. c) The alternative hypothesis is that the slope is not zero. d) All else being equal, the greater the F statistic, the greater the evidence against the null hypothesis