Dr. Jones systematically varies the temperature in the laboratory (70, 80, and 90 degrees Fahrenheit) while holding other variables constant, and observes that the participants' activity level decreases as the temperature increases. This illustrates ____.
a. a non-causal relationship between temperature and activity level
b. a causal relationship between temperature and activity level
c. no relationship between temperature and activity level
d. a nonsystematic relationship between temperature and activity level
Question 2
Systematic error in an estimate is referred to as ____.
a. bias
b. variance
c. range
d. displacement
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