Unit sales (in 1000s of units) for Kingston Products and Mile 10 Inc.are shown for the last four years.Compute the (population) covariance for the two sets of data. 
Definitions:
French Vocabulary
The set of words and phrases used in the French language, essential for communication and comprehension.
Motivated Forgetting
The psychological phenomenon in which people unconsciously block memories of stressful or traumatic experiences.
Proactive Interference
This refers to the phenomenon where old memories hinder the recall of newly formed memories.
Previous Year
The year immediately before the current year, often referenced in discussions of past events or analyses of trends.
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