You are an ecologist studying the impact of fertilizer that was leaked into a lo

Question

You are an ecologist studying the impact of fertilizer that was leaked into a local pond on the amount of toxic red alga in the pond. Past research as indicated that the population mean for the amount of toxic red alga in the pond was 1000 alga per square meter when there is not fertilizer in the pond. However, for your hypothesis test, you are comparing the unknown amount of red alga in the pond that contains fertilizer compared to the known amount of red alga in ponds when it did not contain fertilizer. You randomly collect water from 41 points of the pond affected by the leaked fertilizer. You want to conduct a single sample t-test to determine whether the leaked fertilizer has a significant and practical effect on the number of red alga per square meter in the pond. You decided to use a two tailed t-test with an alpha level of 5% to determine whether the leaked fertilizer has both statistical and practical significance on the amount of alga in the pond. what are the independent variable and what is the dependent variable?

Explanation / Answer

Reseacher want to test the effect of leaked fertilizer on the amount of alga in the pond. So,

Independent variable is: Leaked fertilzer (yes/no)

Dependent variable: Amount of alga in the pond

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