Mathematics, 27.03.2020 00:23 genyjoannerubiera
In a study of the joint toxicity of copper and zinc, researchers randomly allocated 25 beakers containing minnow larvae to receive one of 25 treatment combinations. The treatment levels were all combinations of 5 levels of zinc and 5 levels of copper added to a beaker. Following a four-day exposure, a sample of the minnow larvae were homogenized and analyzed for protein. These data are available on the course webpage under the filename protein. txt. The data appear in three columns as copper level (ppm), zinc level (ppm), and protein (µg/larva), respectively. Treating protein as the response and the copper and zinc levels as the explanatory variables, fit a full second-order (including interactions) linear model, and perform backward elimination based on partial significance (p-value) with α = 0.05. Summarize which variables were removed at each step. [Since there are higher-order terms in this model, I would avoid running any R-automated backward elimination procedures you might find.]
Answers: 2
Mathematics, 21.06.2019 16:30
Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores
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Mathematics, 21.06.2019 17:00
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In a study of the joint toxicity of copper and zinc, researchers randomly allocated 25 beakers conta...
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