The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium. Researchers K. Lee and K. Dunton of the Marine Science Institute of the University of Texas at Austin noticed that the sea grass beds in Corpus Christi Bay (CCB) were taller and thicker than those in Lower Laguna Madre (LLM). They compared the sediment ammonium concentrations in the 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.
At the 1% significance level, is there sufficient evidence to conclude that the mean sediment ammonium concentration in CCB exceeds that in LLM?
Answer to relevant QuestionsRefer to Example 10.6 on page 411. The researchers also obtained the following data on the number of acute postoperative days in the hospital using the dynamic and static systems. At the 5% significance level, do the data ...Refer to Exercise 10.72 and determine a 98% confidence interval for the difference, μ1 − μ2, between the mean sediment ammonium concentrations in CCB and LLM. In Exercise 10.73, you conducted a nonpooled t-test to decide whether the mean number of acute postoperative days spent in the hospital is smaller with the dynamic system than with the static system. a. Using a pooled ...Tukey's Quick Test. In this exercise, we examine an alternative method, conceived by the late Professor John Tukey, for performing a two-tailed hypothesis test for two population means based on independent random samples. To ...Independent; n1 = 17, n2 = 17; Fig. 10.13 Provides a type of sampling (independent or paired), sample size(s), and a figure showing the results of preliminary data analyses on the sample(s). For independent samples, the ...
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