DS 11.4.1 contains Young's modulus measurements for four different types of nanowires. Use the Kruskal-Wallis test procedure to investigate whether there is any evidence of a difference in the types of nanowires.
(a) What are the average ranks 1., 2., 3.,and 4.?
(b) What is the value of the test statistic H?
(c) Write down an expression for the p-value and use a computer package to evaluate it.