Samples of pages were randomly selected from the three books The mean number of words per sentence was computed for each page and the analysis of variance results from some statistical software are shown below Using a 0 05 significance level find the test statistic F and the critical value of F The mean number of words per sentence taken from samples of pages that were randomly selected from three books Source DF WORDS 2 SS MS 266 5 133 3 3 91 Error 33 1123 7 34 1 Total 35 1390 3 F P 0 030 O Test statistic F 3 91 Critical value of F is approximately 6 56