Question

An ecologist studied the habitat of a marine reef fish, the six bar wrasse
(Thalassomahardwicke), near an island in French Polynesia. She examined 48 patch
reef settlements at each of two distances from the reef crest: 250 metres and 800
metres. For each patch reef, she calculated the 'settler density', the number of settlers
or juvenile fish per unit of settlement habitat. Before collecting the data, she
hypothesised that the settler density might decrease as distance from the reef
increased, since the way the waves break over the reef crest causes resources (eg.
Food) to tend to decrease as distance from the reefcrest increases.
a. From the normality plots, argue that a t test should be run on this data. l2l
b. Present an argument for which of the three test outputs we should use to test
the ecologist's hypothesis.
c. Perform the test, making sure you include all steps.

Answer 1

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