A journal article reports a statistically signiﬁcant ANOVA for four groups of n = 12 subjects with means of 1,5,7, and 8, with F = 3.86 > Fcrit = 2.82.(a) Compute the width of the 95% conﬁdence interval for a single mean. (b) Compute the width of the 95% conﬁdence interval for the diﬀerence between two means. (c) Which of the six possible comparisons of two means would have 0 outside of the conﬁdence interval for their diﬀerence?
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