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# Day-Ch 1-Practicing

### Day - Ch 1 - Practicing Science

science a way of learning about the natural world through observations and logical reasoning; leads to a body of knowledge
observing the process of using one or more of your senses to gain information
quantitative observation an observation that deals with a number of amount
classifying the process of grouping together items that are alike in some way
making models the process of creating representations of complex objects or processes.
evaluating comparing observations and datato reach a conclusion about them
scientific investigation the process in which a scientist asks a question about the natural world, collects and analyzes data to help answer the question, and communicates the results to the scientific community
qualitative observation an observation that deals with characteristcs that cannot be expressed in numbers
inferring the process of making an inference, an interpretation based on observations and prior knowledge
predicting the process of forecasting what will happen in the future based on past experience or evidence
Metric system a system of measurement based on the number 10
International System (SI) a system of units used by scientists to measure the properties of matter.
mass the measure of how much matter is in an object
weight the measure of the force of gravity acting on an object
volume the amount of space that matter occupies
density the measurement of how much mass of a substance is contained in a given volume.
estimate an approximation of a number based on reasonable assumptions
accuracy how close a measurement is to the true or accepted value
precision how close a group of measurements are to each other
significant figures all the digits in a measurement that have been measured exactly, plus one digit whose value has been estimated,
percent of error a calculation used to determine how accurate, or how close to the true value an experimental value really is.
mean the numerical average of a set of data
range the difference between the greatest value and the least value in a set of data
median the middle number in a set of data.
mode the number that appears most often in a list of numbers
anomalous data data that do not fit with the rest of a set of data
graph a picture of information from a data table; shows the relationship between variables
line graph a graph that shows changes over time
nonlinear graph a line graph in which the data points do not fall in a straight line
Scientific inquiry the ongoing process of discovery in science; the diverse ways in which scientists study the natural world and propose explanations based on evidence they gather
observational research research that involves investigations trying to observe an event without interfering
hypothesis a possible explanation for a set of observations or an answer to a scientific question; must be testable
dependet variables the factor that changes as a result of changes to the independent variable in an experiment; also called the responding variable
data facts, figures, and other evidence gathered through observations
variables a factor that can change in an experiment
independent variables the one factor that a scientist changes during an experiment; also called the manipulated variable
controlled experiment an experiment in which only one variable is manipulated at a time
opinion-based research research that involves investigations asking people quesions using surveys and interviews
linear graph a line graph in which the data points yield a straight line
Created by: Mrs. Day