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26-Sci Method

QuestionAnswer
qualitative observations Observations that are made using our five senses AND can't be easily measured Usually descriptive words/adjectives Ex: The dog is brown with white spots.
quantitative observations Observations that can be measured with numbers. Ex: The dog is 50 cm long.
valid (validity) Accurate, reasonable, true, EX: An experiment will be MOST VALID if there is only ONE INDEPENDENT VARIABLE, a large SAMPLE SIZE (many subjects), and all other factors in the experiment kept CONSTANT
subjects who or what you are testing/experimenting on
sample size The group of subjects being used in an experiment **The larger the sample size, the better the validity (truthfulness) of the results!*
control group A group in an experiment that is used for comparison because shows the natural conditions. The control group DOES NOT get the experimental (independent) variable!
experimental group The group that gets the experimental (independent) variable.
constant Things that are kept the same in an experiment
data --Information collected while doing an experiment --Usually organized into tables, graphs, charts
independent variable The "I Change" variable. The variable that that YOU (the scientist) are testing or changing. There can only be ONE for every experiment.
dependent variable It is what you are measuring. It changes based on the independent variable.
Conclusions Your results when you are done with an experiment. When we ask, “Was my hypothesis supported?” OR “Is more data needed?” OR “Are different procedures needed?”
Scientific Method An organized way for scientists to solve problem
hypothesis A statement that gives a possible explanation or prediction to an event. Has to be a TESTABLE statement--(that can be proven true or untrue.) Often written in "If......, then...." format Ex: IF a plant gets more sunlight, THEN it will grow faster..
How to use a ruler accurately? Make sure the object being measured is straight and check the lines carefully.
How to use a graduated cylinder accurately? Figure out the scale of the cylinder. (how much is each line worth?) Always measure from the BOTTOM of the curve (the meniscus).
Created by: Mrs. Curcio
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