Ed Rogers owns an appliance store. Sales data on a particular model of a DVD player for the past six months are: 
Forecast sales for July using an exponential smoothing model with a smoothing constant of 0.40. Assume that the forecast for May was 36.25.
Definitions:
Self-concept
An individual's perception of themselves, encompassing beliefs, feelings, and thoughts about one's abilities, appearance, and personality.
Carl Rogers
An influential American psychologist who founded the person-centered approach to therapy and emphasized the importance of the self-concept.
Congruent
Matching or in agreement; used to describe when two or more things are in harmony or are identical in shape and size.
Humanistic
Pertaining to a psychological perspective focusing on individual free will, self-fulfillment, and the concept of self-actualization.
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