1. Solve by hand. Zonation can be observed in microhabitats such as the intertidal shoreline of a bay. A study was conducted on the distribution of the common gastropod Bembicium at various levels about 3 m apart in the intertidal zone at Polka Point. Several 0.25-m2 quadrats were placed along zones 1, 2, and 3 (zone 2 is mean water level) and the number of Bembicium in each were counted.

Zone 1	Rank	Zone 2	Rank	Zone 3	Rank
0		29		4
2		33		6
12		38		16
16		43		27
16		47		41
21		54
23		67

1. State the appropriate null and alternative hypotheses for these data.

1. Rank all the observations (use midranks when necessary) and compute the sums of the sample ranks Ri.

1. Compute the Kruskal-Wallis test statistic H for these data and determine whether H0 should be rejected.

1. If necessary, carry out paired comparisons.

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