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  3. 1. two streams (brimer and standifer creeks) locat

1. Two streams (Brimer and Standifer creeks) located in the same watershed are similar in size/shape...

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Basic Math

1. Two streams (Brimer and Standifer creeks) located in the samewatershed are similar in size/shape and most habitat conditions(e.g., temperature, dissolved oxygen, channel substrate); however,they exhibit different pH values. Brimer Creek has a mean pH of6.1, whereas Standifer Creek has a pH of 5.6. A stream ecologistwishes to determine whether the pH has an influence on the localdistributions of benthic macroinvertebrates (annelids, crustaceans,insects) in the two streams. Two study sites were established (onein each stream) that are in close proximity to each other (~50 mapart, separated by a ridge) and located near the mouths of theirrespective streams. Benthic invertebrates were collected at the twosites using a standardized kick-sampling technique (equal samplingtimes and areas). Invertebrates were counted in samples from thetwo sites. The data are summarized below. Number of invertebratesper sample: Brimer Creek, n = 1373 individuals Standifer Creek, n =955 individuals Perform a G-test for goodness of fit (? = 0.05) totest the ecologist’s hypothesis.

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To test whether pH of the creek has an influence on the localdistributions of benthic macroinvertebratesie To    See Answer
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