PS1 206A F07

PS1 206A F07 - ESM 206 Problem Set 1 MicroExam due Friday,...

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ESM 206 Problem Set 1 MicroExam due Friday, December 7 For the short version, I recommend trying at least A1, 5, 6, 7, 9; in section B, doing the power analysis for at least one of each type of t-test; doing all problems in sections C, E, and F; and in section D, assessing normality for problems 1 and 9. A: t -test practice For each of the following questions, (a) state the appropriate null and alternate hypotheses; (b) state which statistical procedure should be used to test the null hypothesis; (c) run the test, reporting the values of t , degrees of freedom, and P ; (d) draw conclusions based on α = 0.1, = 0.05, = 0.01, and = 0.001. 1. A species of marine arthropod lives in seawater that contains calcium in a concentration of 30 mmole/kg of water. Thirteen of the animals are collected and the calcium concentrations in their coelomic fluid are found to be: 28, 27, 29, 29, 30, 30, 31, 30, 33, 27, 30, 32, and 31 mmole/kg. Test the appropriate hypothesis to conclude whether members of this species maintain a coelomic calcium concentration less than that of their environment. 2. Twenty-five intertidal crabs were placed in air at 24.3 ° C, and their body temperatures were measured as: 25.8, 24.6, 26.1, 22.9, 25.1, 27.3, 24.0, 24.5, 23.9, 26.2, 24.3, 24.6, 23.3, 25.5, 28.1, 24.8, 23.5, 26.3, 25.4, 25.5, 23.9, 27.0, 24.8, 22.9, 25.4. Test the appropriate hypothesis to conclude whether members of this species maintain their bodies at a different temperature than the air. 3. The menstrual cycles in a random sample of fifteen women, measured in days, were found to be: 26, 24, 29, 33, 25, 26, 23, 30, 31, 30, 28, 27, 29, 28. Test the appropriate hypothesis to determine whether the average human menstrual cycle equals a lunar month (29.5 days). 4. Over eight repeated experiments, the dissolving time (in seconds) of a drug in gastric juices was found to be: 42.7, 43.4, 44.6, 45.1, 45.6, 45.9, 46.8, 47.6. Test the null hypothesis that the mean dissolving time is no more than 45 seconds. 5.
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PS1 206A F07 - ESM 206 Problem Set 1 MicroExam due Friday,...

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