For which one of the following situations would a Kruskal-Wallace test be appropriate?
(a) The Mohs scale rates the hardness of minerals. If one mineral can scratch another, it is judged to be harder. (Diamond, the hardest mineral, is a 10.) Is hardness related to the weight of a 1 Ãâ 1 Ãâ 1 cm cube of the mineral?
(b) Each member of a group of professional chefs rates the quality of a basket of organic vegetables on a 5-point scale. The same chefs then rate the quality of a basket of non-organic vegetables on the same scale. Are the organic veggies rated higher?
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(c) During its initial release, is there an association between the number of downloads of a new smartphone game and the number of hours since it has been released?