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Definitions
Definitions 2
Definitions 3
Review Questions
NJ ASK Questions
100
Define variable.
What is a changeable factor?
100
Define research question.
What is a question used to focus the purpose of a scientific investigation and the procedures used to complete it?
100
Define free test.
What is a test that makes a change in just one independent variable at a time, to see how the change affects the dependent variable?
100
Juanita has built a wood glider but it doesn't fly as far as she liked. She takes the glider to her school gym, and makes ten test flights. Name two things Juanita must do to know the distances of the shortest longest flights?
In order for Juanita to know the distances of the shortest and longest flights, she must measure the distances of each flight, and record each distance she measured.
100
How does the scientific community confirm that scientist's work is valid.
Other scientists carry out the same experiment to see if they get the same result.
200
Define conclusion.
What is a decision based on investigation and evidence.
200
Define dependent variable.
What is the factor in an experiment that changes as a result of a change in an independent variable?
200
Define systematic investigation.
What is an investigation in which all variables are identified and recorded so that the investigation can be repeated?
200
Juanita built a wooden glider, but it doesn't fly as far as she would like. Juanita considers shortening the wings, adding weight near the nose, and lengthening the tail... all at the same time. She realizes that this is not the best way to figure out how to improve her glider. Explain why.
Juanita should test only one variable at a time.
200
Jack hypothesized that robins prefer larger birdhouses than smaller ones. He built 4 birdhouses in different sizes. What was the independent variable?
What is the size of the birdhouse.
300
Define hypothesis.
What is a testable idea?
300
Define independent variable.
What is a variable that is isolated for study in an experiment and that the experimenter manipulates?
300
Define reproducible.
What is having the ability to get similar results from multiple trials?
300
Juanita built a wooden glider, but it doesn't fly as far as she would like. If you were Juanita, which variable would you change first? Wingspan, weight, or tail length?
Instead of changing all three variables, I would lengthen the tail, so the glider would become more balanced.
300
In 1999, researchers claimed that they had made a new element. Two other teams of researchers repeated the experiment, but could not reproduce the results. What does this say about scientific inquiry?
Experimental results must be reproducible to be accepted as valid.
400
Define accuracy.
What is the degree of conformity of a measure to a standard or a true value?
400
Define controlled variable.
What is a variable that is kept the same from trial to trial.
400
Define sample size.
What is the number of observations or data.
400
Juanita built a wooden glider, but it doesn't fly as far as she would like. Suggest how she can keep factors such as wind speed and direction constant in her trials.
Juanita should conduct each one of her trials in the same place and relatively the same time, so the wind speed and the direction stay the same.
400
Lewis wanted to see if a new brand of shoes made basketball players jump higher. 18 basketball players tried out the shoes and their jumping height was measured. What is the error?
There is no control group.
500
Define constant.
What is a controlled variable in an experiment that is kept the same from trial to trial?
500
Define control group.
What is a set of observations made in an experiment, in which the independent variables are not changed, to be sure that the dependent variable remains the same also?
500
Juanita built a wooden glider, but it doesn't fly as far as she would like. What is Juanita's control group?
Her control group is her first ten test flights.
500
Paco wants to see if new baseballs fly farther than old baseballs. More home runs have been hit this year, so he thinks they have more bounce. Paco wants to test this hypothesis. Identify the dependent variable, independent variable, and one constant in the experiment.
Dependent variable- the distance of the hit Independent variable- the baseball Constant- batter