A regression analysis between demand (Y in 1000 units) and price (X in dollars) resulted in the following equation 
= 9 - 3X
The above equation implies that if the price is increased by $1, the demand is expected to
Definitions:
Experimenter Error
Mistakes or biases introduced by researchers that can affect the outcome of an experiment, potentially leading to invalid results.
Control Group
In experimental research, this is the group that does not receive the experimental treatment, serving as a comparison point to gauge the effect of the treatment.
Experimental Group
In research, a group of subjects who are exposed to the variable under study to ascertain its effect on them, in contrast to a control group.
Married Couples
Two individuals formally united in a legal or recognized bond, often involving emotional, social, and economic partnership.
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