#3
Sand and clay studies were conducted at a site in California.Twelve consecutive depths, each about 15 cm deep, were studied andthe following percentages of sand in the soil wererecorded.
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Convert this sequence of numbers to a sequence of symbols A andB, where A indicates a value above the median and B denotes a valuebelow the median.  Test the sequence for randomness aboutthe median with a 5% level of significance. What is the value ofthe sample test statistic R, the number of runs?
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R = 8
R = 9
R = 7
R = 4
R = 6
