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Unformatted text preview: rimental Design Applied 2. Identify the dependent and independent variables in the following investigations. (Circle the
dependent variable and underline the independent variable.)
a) The number of aborted foals are counted for mares grazing in fields with and without
black cherry trees on Kentucky horse farms.
b) Scientists observed and recorded pecking patterns and underwing color markings of an
unknown woodpecker to determine the species: common pileated woodpecker or,
rarest-of-rare, ivorybilled woodpecker.
c) Number and size of cubs born to polar bears in 1990 and 2000. 3. Suggest a control treatment for each of the following experiments.
a) Frogs are captured from ponds where the parasitic worm Robeiroia is abundant. The
number of limb deformities is recorded.
Control treatment: b) Patients with the eating disorder anorexia nervosa are given Prozac to alleviate
symptoms. Control treatment: c) Children with autism are given a diet free of gluten.
Control treatment: 4. In a recent study of 10,000 women scientists reported that women who had breast cancer had
a history of heavier antibiotic use than women who did not have breast cancer. What possible
explanations for this correlation can you suggest? 5. What is the essential feature of science that makes it different from other ways of
understanding the natural world? Biology 6C 21 22 Exercise 1.B. Scientific Investigation: Experimental Design Applied...
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