Can someone explain this to me in the simplest way possible

Can someone explain this to me in the simplest way possible? Is it because the bar graph decreases as it goes down? Also, in what cases would the other answers be appropriate?

A study of properties of metal plate-connected trusses used for roof support yielded the following observations on axial stiffness (\"Stiffness\') for plate lengths (Lengths\') 4, 6, 8, 10 and 12 inches. A JMP analysis of these data follows. Use this output to answer problem 5, which follows. Oneway Analysis of stiffness By lengths Oneway Anova Analysis of Variance Sum ef SourceDF Squares Mean Square FRatio ProbF angths 4 43992551 30 31475 031 34 75467 583 Means Comparisons Comparisons for all pairs using Tukey-Kramer HSD Connecting Letters Report 12 A 43717143 10 AB 40735724 BC 375.12857 5 BC 6805714 C 33321429 Loveis nor connected by same e are sigrificantly dilerent. Ordered Differences Report Level Level Difference Std Em Dif Lower CL Upper CL p-Value 12 4 10 4 12 6 12 8 03.9571 1731364 537370 154.17730001 741429 1731364 239227 124.3630 0.0015 69.1143 1731364 188942 119.3344 0.0033 620429 1731364 118227 11.230 0.009* 41.9143 1731364-3058 921344 a13741 393000 1731364 109201 895201 01827 348429 1731364 153773 85.0630 02847 322286 1731364 \"17.9916 824487 0.3591 :l: 298143 1731364 204058 800344 04363 10 6 10 8 1799 80034 s: 7.0714 1731364 43147 572916 0938 Compared to the confidence intervals given at the bottom of the above output, individual 95 percent confidence intervals based on the 2-sample t distribution would be: b. C. d. e. narrower than Tukey 95% simultaneous confidence intervals wider than Tukey 95% simultaneous confidence intervals. either narrower or wider than Tukey 95% simultaneous confidence intervals. preferred to Tukey 95% simultaneous confidence intervals. none of the above.

Solution

Yes, it is because the bar graph decreases as it goes down. It would be wider when the bar graph would be increasing as it goes down. It would either be narrower or wider when the bar graph would have no fixed pattern.