Age could affect reaction time, as well as nicotine. How could the researcher have controlled for this potential extraneous variable?
a) by randomly selecting participants from the population
b) by counterbalancing the order of stimulus presentation across participants
c) by matching each participant in the experimental group with a participant of the same age in the control group
d) by using a different dependent variable
Question 2
You should write out numbers (e.g., twenty five) when
a. beginning a sentence.
b. it is larger than ten.
c. it represents something other than data.
d. using the metric system.
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