Stuttering. Researchers S. Reilly et al. studied the indicators of stuttering onset and the potential effects that stuttering may have on a child in the article “Natural History of Stuttering to 4 Years of Age: A Prospective Community-Based Study” (Pediatrics, Vol. 132, Issue 3, pp. 460–467). The following table provides the scores on the Communication and Symbolic Behavior Scale (CSBS), an assessment tool used to identify communication disorders, for random samples of stuttering and nonstuttering children.

Stutterers Nonstutterers 120 109 77 119 72 101 93 95 116 84 122 108 127 126 111 99 92 97 107 108 105 81 123 107 75 At the 10% significance level, do the data provide sufficient evidence to conclude that, in this age group, there is more variation in CSBS scores for stutterers than for nonstutterers? (Note: s1 = 17.326 and s2 = 15.745.)