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:
Voltmeter
An instrument used to measure a level of voltage.
Voltmeters
Instruments used to measure electrical potential difference between two points in an electric circuit.
Single Range
This term could refer to devices or instruments that have only one scale or measurement range, limiting their versatility across different measurement values.
Ayrton Shunt
An ammeter shunt that permits multiple range values.
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