Suppose that data on labour productivity and unit labour costs were obtained for the retail industry from 1990 through 2009. 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:
Multiskilled Healthcare Professional
A healthcare worker trained to perform a wide range of tasks across various disciplines and functions in the healthcare field to improve efficiency and care.
Patient's Diagnosis
Pinpointing the nature of a health condition or difficulty by inspecting the indicators.
Clinical Duty
Tasks and responsibilities performed by healthcare professionals in a clinical setting to provide patient care and support medical operations.
American Association of Medical Assistants
A professional organization for medical assistants that provides certification, education, and support.
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