As part of the United States Census, data is also collected on the number of persons in each household. The census data for four decades is summarized below. 
(a)In a few sentences describe how the proportion of households with 4 people has changed from 1970 to 2000.
(b)What size of household appears to have decreased the most from 1970 to 2000?
Definitions:
Attentive Listening
The active, focused process of hearing, understanding, and responding to spoken messages.
Quiet Voice
A soft or subdued tone of voice that may reflect calmness, uncertainty, or a desire not to attract attention.
Western Industrialized Countries
Nations primarily located in the Western Hemisphere that are characterized by high levels of industrialization, advanced technological infrastructure, and higher standards of living.
Finger Tapping
A simple motor task used in psychological and neurological tests to assess motor speed, coordination, and sometimes cognitive abilities.
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