Exhibit 13.4 The ANOVA test performed for Exhibit 13.2 determined that not all mean commute times across the four cities are equal.However,it did not indicate which means differed.To find out which population means differ requires further analysis of the direction and the statistical significance of the difference between paired population means.Tukey 95% confidence intervals are shown below. Refer to Exhibit 13.4.How many pairs of cities show a significant difference in average commute times to work?
A)2
B)3
C)4

Question

Exhibit 13.4 The ANOVA test performed for Exhibit 13.2 determined that not all mean commute times across the four cities are equal.However,it did not indicate which means differed.To find out which population means differ requires further analysis of the direction and the statistical significance of the difference between paired population means.Tukey 95% confidence intervals are shown below.  Refer to Exhibit 13.4.How many pairs of cities show a significant difference in average commute times to work?
A)2 
B)3 
C)4

Quizplus · Accepted Answer

Looking at Exhibit 13.4, we can see that the Tukey 95% confidence intervals show that there are three pairs of cities whose intervals do not overlap, indicating a statistically significant difference in average commute times to work between those pairs. Therefore, the answer is B)3.