Suppose that data on labour productivity and unit labour costs were obtained for the retail industry from 1995 through 2014. A regression was estimated to describe the linear relationship between the two variables.
a. Based on the plot of residuals versus predicted values, is the linear model appropriate? Explain. 
b. Would a re-expression of the data help? If so, what would you recommend?
Definitions:
Autonomous Motivation
A type of motivation that comes from within an individual, driving them to engage in behavior out of personal interest or satisfaction.
Self-Actualization
The realization or fulfillment of one's talents and potentialities, regarded as a drive or need present in everyone.
Motivated by Needs
The drive or inclination to act or behave in a certain way based on the desire to fulfill basic requirements for survival, security, belonging, esteem, and self-actualization.
Needs for Existence
Basic requirements necessary for survival, such as food, water, shelter, and safety.
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