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Zonation is a process of adaptation that can occur when various organisms compete for resources in a small area and can be observed in microhabitats such as the intertidal shoreline of a bay. Moving a distance of a meter or two perpendicular to the waterline can drastically change the amounts of moisture, temperature, and salinity. Different organisms tolerate different extremes and zonation occurs. While at north Stradbroke Island, students carried out exercises to quantify these processes. The intertidal zone (the shore between the lowest low tide and the highest high tide) was divided into five equal-width bands parallel to the waterline. Square-meter quadrats were used to repeatedly sample the various bands for marine organisms. One subset of the data was used to study the vertical zonation of the intertidal zone by various gastropods such as Bembecium, Austrocochlea, and Nerita. The data below show the distribution of Bembecium at 12 locations where counts were made at the mean water mark and at one zone above it. Is there a difference in the distribution of Bembecium in the two zones? Conduct a sign-test at a 0.05 level of significance.

Above: 81,20,25,62,41,28,43,50,48,31,39,24

Mid-Shore:135,15,31,81,59,72,66,101,36,92,59,41