Hennington pond was the only pond on the FIU campus not treated with chemicals o

Question

Hennington pond was the only pond on the FIU campus not treated with chemicals or subjected to storm run-off. In March 2007, a sewage main ruptured and the lake became contaminated with sewage effluent. You have been provided with data on the Phosphorus levels in Hennington pond for two years: 2004 (before perturbation) and 2007 (after perturbation). For both years, sampling was conducted by collecting water samples from 20 random sites within the pond. Based on observations of Hennington pond during 2004 and 2007, we could ask the following question: Has the Phosphorus level in Hennington pond changed between 2004 and 2007? Write a null and alternative ecological hypothesis for this study. Write a null and alternative statistical hypothesis for this study. Are the alternative hypotheses you wrote one-tailed or two-tailed? Why does this matter? What would you set your alpha value at? WHY?

Explanation / Answer

Alternative hypothesis

it is defined as the mean difference between paired

observations is not eequal to zero.it is a two tailed test.

(Becaused we used to test the claim that whether the phosphorus level changed or not between years)

H1 : mu not equal to zero

(two tailed test)

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