Suppose the given data on phosphorus concentration in topsoil for four different soil treatments appeared in a research article.
Treatment
Concentration (mg/g)
I
8.1
5.9
9.0
8.0
6.0
II
12.5
10.9
13.1
10.3
12.9
III
15.3
19.4
17.4
15.8
17.0
IV
21.0
31.0
28.4
24.6
29.7
Use the KW test and a 0.01 significance level to test the null hypothesis of no difference in true mean phosphorus concentration for the four soil treatments. (Let ðœ‡1, ðœ‡2, ðœ‡3, and ðœ‡4 be the mean phosphorus concentrations for soil treatments I, II, III, and IV, respectively.)
KW = 17.86
1. State the rejection region. (Use technology or SALT to calculate the critical value. Round your answer to two decimal places.)
KW > 9.49