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Review Questions
NJ Ask Pratice
100
Define accuracy.
What is the degree of conformity of a measure to a standard or a true value?
100
Define dependent variable.
What is the factor in an experimant that changes as a result of a change in an independent variable?
100
Define research question.
What is a question used to focus the purpose of scientific invesitgation and the procedures used to complete it?
100
Name two things Juanita must do to know the distances of the shortest and longest flights?
What is in order for Juanita to know the distances of the longest and shortest flights she must measure the distance of each flight and record each distance she measures.
100
How does the scientific community confirm that a scientist's work is valid?
What is other scientist carry out the same experiment to see if they get the same result?
200
What is a decision based on investigation and evidence?
What is conclusion?
200
Define fair test.
What is an experiment in which one independent variable is tested by keeping all other independent variables the same?
200
Define sample size.
What is the number of observations or data?
200
Why do you think Juanita decided that this was not the best way to figure out how to improve her glider?
What is she should test one independent variable at a time?
200
Dietrich designed an experiment to test the following hypothesis: the mass of a pendulum bob does not affect how long it takes pendulum to make one complete swing. Four steps of the of the activity are listed below, but not in the correct order 1. Find the masses of four different bobs 2. Construct a table in which to record data 3. Time the duration of one swing 4. Tie the four bobs to four strings of equal length.
What is 2-1-4-3?
300
Define constant.
What is a controlled variable in an experiment that is kept the same from trial to trial?
300
Define hypothesis.
What is an idea that can be tested by a scientific investigation?
300
Define systematic investigation.
What is an investigation in which all variables are identified and recorded so that the investigation can be repeated?
300
Why might it be difficult to test just one independent variable at a time?
What is many variables are at work when conducting experiments it's hard to name them all?
300
Jack hypothesized that robins prefer large birdhouses of different sizes to test his hypothesis. What was the independent variable in Jack's study.
What is the size of the birdhouse?
400
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.
What is the control group?
400
Define independent variable.
What is a variable that is isolated for study in an experiment and that the experimenter manipulates?
400
Define variable.
What is a factor that changes in an experiment?
400
Juanita considers shortening the wings, adding weight near the nose, and lengthening the tail all at the same time. Afters some thinking, she realizes that this is not the best way to figure out how to improve her glider. Why do you think Juanita decided that this was not the best way to figure how to improve her glider?
She should test one independent variable of a time.
400
Annessa designed an experiment to study how temperature affects he rate at which an enzyme digests a protein. She put equal masses of liver into four equal-sized test tubes, brought the test tubes to different temperatures, introduced equal amounts of enzyme to each tube, and measured the duration of the chemical reaction. What parameters were held constant in Annessa's experiment?
What is Scientist know that anything written in a textbook is valid.
500
Define controlled variable.
What is a variable that is kept the same from trial to trial?
500
Define reproducible.
What is having the ability to get simlar results from multipe trials?
500
Fill in the blanks with vocab words in the sentence. Because controlled variables should be kept the same from trial to trial, scientists call them _____.
What is constants?
500
Juanita chooses her independent variable. She will change the weight along the body of the glider. She will put a 25-gram (g) clap at one spot along the bottom and the the glider five times. Then, she will move the clip to a different spot on the body and throw the glider five more times. What is the independent and dependent variable?
What is the independent variable is the 25 gram clip and the dependent variable is the distance?
500
In 1999, a team of researchers claimed that it had made a new element. Two other teams repeated the experiment but could not reproduce the results. The original team took back its claim. What do these events say about the process of scientific inquiry?
What is experimental results must be reproducible to be accepted as valid?