State the appropriate nonparametric test for each of the following examples.
(a) A researcher measures the time it takes to complete a surgical procedure in a sample of surgeons with low, medium, or high skill level.
(b) A clinical researcher records the number of calories a group of obese patients consumes each day for 5 days.
(c) A social psychologist measures the time it takes children to complete a creativity task first in the presence and then in the absence of a parent.
(d) A cognitive psychologist measures the time it takes a sample of students to complete a memory task. The students are divided into one of three groups: no distraction, moderate level of distraction, or high level of distraction.