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Unformatted text preview: species altitude before 1986 (meters) altitude 1986 or later (meters) Acer campestre 642 660 Carpinus betulus 380 446 Daphne laureola 812 982 Viburnum lantana 941 1019 a. Find the four differences [altitude later ! altitude before]. This is the random sample of differences. b. What assumption do you need to be able to do a test or make a confidence interval using this data? c. Find the mean and standard deviation of the differences. d. Test the claim that the average difference ( μ ) in the population of all of the woody plants is positive (>0). (This would mean that all of the plants are living higher on the mountain than they had been, on the average.) Give the null and alternate hypotheses, the value of t, the approximate value of P, and your conclusion. e. Find a 90% confidence interval for the average distance all of the plants have moved up the mountain ( μ )....
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 Spring '08
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 Statistics, Normal Distribution, Probability, Standard Deviation, San Francisco Bay, average selenium content, Carpinus betulus

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