Consider the display panel situation in Exercise 11.3, and let A, B, and C (represent the mean times to stabilize the emergency condition when using

Consider the display panel situation in Exercise 11.3, and let µA, µB, and µC (represent the mean times to stabilize the emergency condition when using display panels A, B, and C, respectively. Figure 11.4 gives the MINITAB output of a one-way ANOVA of the display panel data in Table 11.3.
FIGURE 11.4
MINITAB Output of a One-Way ANOVA of the Display Panel Study Data in Table 11.3

a. Test the null hypothesis that µA, µB, and µC are equal by setting α = .05. On the basis of this test, can we conclude that display panels A, B, and C have different effects on the mean time to stabilize the emergency condition?
b. Consider the pairwise differences µA - µB, µC - µA. Find a point estimate of and a Tukey simultaneous 95 percent confidence interval for each pairwise difference. Interpret the results by describing the effects of changing from using each display panel to using each of the other panels. Which display panel minimizes the time required to stabilize the emergency condition?
c. Find an individual 95 percent confidence interval for each pairwise difference in part b. Interpret the results.

One-way ANOVA Time versus Display Tukey 95% Slaul taneous Confidence Interval Source Dr Luplay 500.17 2500 30.22 0.000 xrOr Total 11 574.92 HS 9 74.75 3 Lower Center pper -9.692 4.000 .692 5558 11.250 16.94 Individual 95 cts For Hean Besed on Pooled StDev 4 24.500 2.66 4 20.500 2645 35-750 3-304 Lovwer CenterUpper 9:556 15.25o 20.942 Pooled StDev 2.882 1s.0 24.0 3o.0 36.0