a) Calculate the confidence interval for the mean time requires to stabilize emergency condition 4 using display panel B.

A study compared three display panels used by air traffic controllers. Each display panel was tested for four different simulated emergency conditions. Twenty-four highly trained air traffic controllers were used in the study. Two controllers were randomly assigned to each display panel-emergency condition combination. The time (in seconds) required to stabilize the emergency condition was recorded. The following table gives the resulting data and the JMP output of a two-way ANOVA of the data. Emergency Condition 3 Display Panel 1 2 4 A 17 25 14 14 24 13 B 15 22 12 19 C 21 29 24 28 Least Squares Means Estimates Panel Estimate Condition Estimate A 21.625000 1 17.166670 18.250000 2 24.500000 25.625000 3 32.333330 4 13.333300 Analysis of Variance Sum of Source DF Squares Model 11 1,504.3333 Error 12 47.0000 C. Total 23 1,551.3333 Effect Tests Source Panel Condition Panel Condition BC 222ENN x 85 mm 32 34 28 31 10 32 15 37 19 1390 Mean Square 136.758 3.917 Sum of Nparm DF Squares R$ B1-2 218.0833 3 1,268.3333 F Ratio 34.9168 Prob > F <.0001 f ratio prob> F <.0001 tukey hsd all pairwise comparisons quantile="2.66776," adjusted df="12.0," adjustment="Tukey" difference std error t ratio panel a b .989529 c condition prob>|t| 1 2 -7.3333 1.142609 -6.42 -15.1667 1.142609 -13.27 3.8333 1.142609 3.35 -7.8333 1.142609 -6.86 (expression error)* -11.2255 11.1667 1.142609 9.77 7.7745 |t| 0.0133* 0.0043* F <.0001 f ratio prob> F <.0001 tukey hsd all pairwise comparisons quantile="2.66776," adjusted df="12.0," adjustment="Tukey" difference std error t ratio panel a b .989529 c condition prob>|t| 1 2 -7.3333 1.142609 -6.42 -15.1667 1.142609 -13.27 3.8333 1.142609 3.35 -7.8333 1.142609 -6.86 (expression error)* -11.2255 11.1667 1.142609 9.77 7.7745 |t| 0.0133* 0.0043*