4. SRandom$samplesSof 3 brandsSofscigarettes$werestestedSforstarscontents. SThesfollowingSfigures$showsthe$milligramsSofstar$foundSinsthe 15 cigarettes$ tested$. Brand A B 16 17 11 15 18 12 17 19 14...

[fourth question]

Extracted text: 4. SRandom$samplesSof 3 brandsSofscigarettes$werestestedSforstarscontents. SThesfollowingSfigures$showsthe$milligramsSofstar$foundSinsthe 15 cigarettes$ tested$. Brand A B 16 17 11 15 18 12 17 19 14 20 10 13 21 11 $Use$the$Kruskal-wallis$test$at$the .05 level$of$significance$to$test$whether $there$is$a$significant$difference$in$the$contentsamong$the 3 brands$of $cigarettes$.