A regression model relating units sold (Y), price (X1), and whether or not promotion was used (X2 = 1 if promotion was used and 0 if it was not) resulted in the following model. 
and the following information is provided. 
a.Is price a significant variable?
b.Is promotion significant?
Definitions:
Free Association
A psychoanalytic technique in which clients are encouraged to express freely any thoughts, feelings, or images that come to mind, without censorship or filtering.
Aversive Conditioning
A behavioral conditioning technique where an unpleasant stimulus is associated with undesirable behavior in order to reduce or eliminate that behavior.
Flooding
Flooding is a psychological treatment method for phobias and anxiety disorders where an individual is exposed to an overwhelming amount of the feared stimulus in order to extinguish the fear response.
Hypochondriasis
A condition characterized by an excessive preoccupation with the fear of having a serious disease.
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