**4.**A(n) _____ is a comparison between an unknown quantity and a standard.**5.**On a graph, the _____ is the line drawn as close as possible to all of the data points.**6.**An explanation that is based on prior scientific research or observations and that can be tested**14.**The _____ is the factor that is changed or manipulated during an experiment and graphed on the x-axis.**15.**A description of how close a measurement is to the correct or accepted value of the quantity measured.**16.**An experiment that tests only one factor at a time by using a comparison of a control group with an experimental group.

**1.**Those digits in a measurement that are known with certainty plus the first digit that is uncertain.**2.**The study of matter and energy is _____.**3.**A mathematical problem-solving method that utilizes conversion factors and treats units as algebraic quantities, which can be cancelled, is called _____.**7.**A parabolic relationship that results when one variable depends on the square of another variable.**8.**A straight line on a graph showing the relationship between two variables.**9.**The degree of exactness of a measurement.**10.**A pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept**11.**A set of particles or interacting components considered to be a distinct physical entity for the purpose of study.**12.**A hyperbolic relationship that exists when one variable decreases as the other variable increases.**13.**The factor in an experiment that depends on the independent variable and graphed on the y-axis.