vocab 1
vocab 2
questions 3
questions 4
questions 5
100
observation
something you find out about objects, events, or living things using your senses
100
experiment
the use of scientific methods to test a hypothesis
100
what is a model?
a model is an object or idea that represents another thing
100
what tool do scientists use to conduct a survey?
scientists use a questionnaire
100
what is the first step in a science experiment
the first step is to ask a question
200
hypothesis
statement of what you think will happen during an investigation
200
data
information from which a conclusion can be drawn or a prediction can be made
200
name four types of scientific invertigations
experiments, models, surveys, and sampling
200
why is it important to do repeated trials?
repeated trials with similar results are needed for a conclusion to be valid
200
what are two kinds of measurements you can make with tools?
you can measure volume and time
300
procedures
step-by-step instructions for completing a task
300
evidence
observations that make you believe something is true
300
is data valid if it is only accurately measured? explain
no. valid data must be measured both precisely and accurately
300
why is it important to tie back long hair and avoid wearing loose clothing when you are doing a science experiment?
long hair could cover your face so you could not observe or measure correctly. loose clothing could knock over objects
300
why is it important that other scientists can repeat experiments?
it is important because results from an experiment that cannot be repeated are unreliable
400
variable
something that can change in a test
400
control group
a standard against which change is measured
400
inference
a conclusion based on observations
400
why do scientists make hypotheses before beginning scientific investigations?
scientists need something on which they can base their investigations
400
explain why a control group is important in an experiment
the control group gives you something to compare to the experimental group
500
precision
the ability to consistently repeat a measurement
500
accuracy
ability to make a measurement that is as close to the actual value as possible
500
what is the difference between an observation and an inference?
an inference is a conclusion that is made based on observations
500
suppose you are doing a presentation for your class about the daily growth of a bean plant over the course of a month. Would you use a chart, a table, or a graph to help explain your results to your class? Explain your answer.
I would use a graph because it displays the data visually
500
suppose a friend wants to find out how many cute pets live in her neighborhood. Could this information be used in a scientific investigation? why or why not?
no. it could not because "cute" is an opinion. scientific investigations must be based on facts.
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