Sand and clay studies were conducted at the West Side Field Station of the University of California. (Reference: Professor D. R. Nielsen, University of California, Davis.) Twelve consecutive depths, each about 15 cm deep, were studied and the following percentages of sand in the soil were recorded. 19.5 27.3 30.4 24.2 33.8 27.4 24.8 18.2 16.4 8.4 1.7 0.1 Test the sequence for randomness about the median. Use α = 0.05. (a) What is the level of significance? (b) Find the sample test statistic R, the number of runs. (c) Find the upper and lower critical values in Table 10 of Appendix II. c1   c2

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Sand and clay studies were conducted at the West Side Field Station of the University of California. (Reference: Professor D. R. Nielsen, University of California, Davis.) Twelve consecutive depths, each about 15 cm deep, were studied and the following percentages of sand in the soil were recorded.

19.5 27.3 30.4 24.2 33.8 27.4 24.8 18.2 16.4 8.4 1.7 0.1

Test the sequence for randomness about the median. Use α = 0.05.

(a) What is the level of significance?
(b) Find the sample test statistic R, the number of runs.


(c) Find the upper and lower critical values in Table 10 of Appendix II.
c1  
c2  
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