ST 412/512 – Midterm Exam w: Key (00) – Methods of Data Analysis II
ST 412/512 – Midterm Exam w: Key (00) – Methods of Data Analysis II
ST 412/512 – Midterm Exam w: Key (00) – Methods of Data Analysis II
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Part B. Acorn data (questions worth 6 points each). Below is a plot <strong>of</strong>Y = log <strong>of</strong> the species range area (1<strong>00</strong>×km 2 ), versusX 1 = log <strong>of</strong> the acorn (seed) volume (cm 3 )for species <strong>of</strong> oak trees from Atlantic and California regions. The species with the smallest Y(species #7) is only found on an island so its range area cannot possibly exceed the area <strong>of</strong> theisland.log <strong>of</strong> Range Area4 6 8 10Regionwith # 7without #7AtlanticCaliforniaspecies # 7-1 0 1 2 3Log <strong>of</strong> Acorn Size11. Based on the scatterplot, circle the letter for the one sentence that describes the probableinfluence <strong>of</strong> species # 7.a) The species is probably not influential.b) The interactive effect <strong>of</strong> log acorn size and region (Atlantic or California) is substantiallymore significant when the species is included than when it is not included.c) The interactive effect <strong>of</strong> log acorn size and region is substantially less significant when thespecies is included than when it is not included.Page 2 <strong>of</strong> 5
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