Is concern about safety with drones, flying over people, related to age? A survey was conducted in Edmonton, Canada, to gather community insight about drones. Participants provided feedback on “I have safety concerns regarding drones flying over people.” Possible answers were “Strongly Agree, Somewhat Agree, Neutral, Somewhat Disagree, Strongly Disagree.” Instead of actual age, categories were provided. Kruskal–Wallis test on drone over people concern

a) Write the null and alternative hypothesis for a Kruskal–Wallis test.

b) According to the table below, is the null rejected at 10% significance?

c) Assuming the distribution of scores per terminal have the same shape, does it appear that the difference between medians is large?

Transcribed Image Text:

Age 18-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 Overall H = 97.97 H = 110.82 N 48 119 224 162 121 124 113 144 99 70 48 18 1290 DF = 11 DF = 11 Median 4.00 4.00 4.00 4.00 4.00 4.00 5.00 5.00 5.00 5.00 4.00 5.00 P = 0.000 P = 0.000 Ave rank 420.9 510.3 547.3 591.6 664.5 663.8 721.7 780.7 761.2 756.5 690.5 843.9 645.5 (adjusted for ties) Z -4.26 -4.16 -4.34 -1.97 0.59 0.58 2.28 4.62 3.22 2.56 0.85 2.28