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# Pre-Algebra Ch. 6

TermDefinition
constant of proportionality a constant ratio or unit rate of a proportion
cross products if a/c = b/d then ad = bc
discount the amount by which the regular price of an item is reduced
percent equation an equivalent form of a percent proportion, where % is written as a decimal (part = percent x whole)
percent of change the ratio of the increase or decrease of an amount to the original amount
percent of decrease the ratio of an amount of decrease to the previous amount, expressed as a percent / a negative percent of change
percent of increase the ratio of an amount of increase to the original amount, expressed as a percent
percent proportion part/whole = % / 100
population a larger group used in statistical analysis
proportion a statement of equality of two or more ratios
proportional relationship the ratios of related terms are equal
rate a ratio of two measurements having different unit rates
ratio a comparison of two numbers by division
sample a subgroup or subset of a population used to represent the whole population
scale the relationship between the measurements on a drawing or model and the measurements of the real object
scale drawing or scale model a drawing that is used to represent an object that is too large or too small to be drawn at actual size
scale factor the ratio of a length on a scale drawing or model to the corresponding length on the real object
simple interest the amount of money paid or earned for the use of money (I=prt)
unbiased sample a random sample that is representative of a larger sample
unit rate a rate simplified so that it has a denominator of 1
Created by: Miss Brinkoetter