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Nitrogen and Seagrass. The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium. Researchers Kun-Seop Lee and Kenneth H. Dunton of the Marine Science Institute of the University of Texas at Austin noticed that the seagrass beds in Corpus Christi Bay (CBB) were taller and thicker than those in Lower Laguna Madre (LLM). They compared the sediment ammonium concentrations in two locations and published their findings in Marine Ecology Progress Series (Vol. 196, pp.39-48). Following are the summary statistics on sediment ammonium concentrations, in micromoles, obtained by the researchers.
CCB LLM
X1=115.1 X2=24.3
S1=79.4 S2=10.5
N1=51 N2=19
At the 1% significance level, is there sufficient evidence to conclude that the mean sediment ammonium concentration in CCB exceeds that in LLM?
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
What is the Chi-square test? Where can you apply it? Please site an example of how it was used and the outcome of the test. I think this could help me better than the book, it is difficult to understand.
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A group of students collected data at the Cedar Point amusement park and reported that the "wait time" to ride the "Top Thrill Dragster" roller coaster is consistently distributed within a range of 40 minutes to 90 minutes.
Construct the 90% and 99% confidence interval for population mean. Which interval is wider? If convenient, utilize technology to construct confidence intervals.
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