Four different leadership styles used by Big-Six accountants were investigated. As part of a designed study, 15 accountants were randomly selected from each of the four leadership style groups (a total of 60 accountants). Each accountant was asked to rate the degree to which their subordinates performed substandard fieldwork on a 10-point scale called the substandard work scale'. The objective is to compare the mean substandard work scales of the four leadership styles. The data on substandard work scales for all 60 observations were subjected to an analysis of variance. ONE-WAY ANOVA FOR SUBSTANDARD BY STYLE SOURCE DF SS MS F p-value between 3 2356. 16 785.387 6.050 0. 0012 within 56 7269.70 129.816 total 59 9625 . 86 Interpret the results of the ANOVA F-test shown on the printout for a = 0.05. At a = 0.05, nothing can be said. At a = 0.05, there is sufficient evidence of differences among the substandard work scale means for the four leadership styles. At a = 0.05, there is insufficient evidence of differences among the substandard work scale means for the four leadership styles. O At a = 0.05, there is no evidence of interaction