In estimating the effect of price on sales, what is likely to be a confounding factor that one would at best have only a proxy variable for?
A. Brand awareness
B. Month
C. Sales
D. Price
Answer: A
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The addition of a strong acid like HCl to an aqueous solution would result in
A. the release of H+ into the solution. B. an increase in pH. C. a decrease in pH. D. both the release of H+ and an increase in pH. E. both the release of H+ and a decrease in pH.
A rapid, powerful movement of short duration that could not be sustained for long would likely
involve mainly
a. fast anaerobic fibers. b. fast aerobic and fast anaerobic muscle fibers. c. slow muscle fibers and fast aerobic muscle fibers. d. slow muscle fibers. e. fast aerobic fibers.
The plant louse Phylloxera was responsible for destroying ____ in Europe
a. orange groves b. orchards c. potato fields d. vineyards e. corn crops
Mitosis takes place in which region of the root?
a. zone of maturation b. root cap c. zone of elongation d. meristem region e. region of differentiation