Show:
Definitions
Definitions
Definitions/?'s
Questions/NJ-ASK
NJ ASK
100
What is systematic investigation?
An investigation in which all variables are identified and recorded so that the investigation can be repeated.
100
What is a dependent variable?
The factor in an experiment that changes as a result of a change in an independent variable.
100
What is a sample size?
The number of observations or data.
100
Suggest how Juanita can keep factors such as wind speed and direction constant in her trials.
She will know the wind speed and direction because it will affect the glider's results.
100
Dietrich designed an experiment to test the following hypothesis: The mass of a pendulum bob does not affect how long it takes the pendulum to make one complete swing. Four steps of the activity are listed below, but not in the correct order.
Construct a table in which to record data, find the masses of 4 different bobs, tie the 4 bobs to 4 strings of equal length, and time the duration of one string.
200
What is research question?
A question used to focus the purpose of a scientific investigation and the procedures used to complete it.
200
What is a controlled variable?
A variable that is kept the same from trial to trial.
200
What is reproducible?
Having the ability to get similar results from multiple trials.
200
Why might it be difficult to test just one independent variable at a time?
It is difficult because you will need all three to work together, or it won't work.
200
Jack hypothesized that robins prefer large birdhouses to small ones. He built four birdhouses of different sizes to test his hypothesis. What was the independent variable in Jack's study?
The size of the birdhouse
300
What is a hypothesis?
An idea that can be tested by a scientific investigation.
300
What is a constant?
A controlled variable in an experiment that is kept the same from trial to trial.
300
Name two things Juanita must do to know the distances of the shortest and longest flights.
She must know the length and width of the glider and she must know her location.
300
What is the control group?
How wide the glider is.
300
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 it's claim. What do these events say about the process if scientific inquiry?
Experimental results must be reproducible to be accepted as valid
400
What is a variable?
A factor that changes in an experiment.
400
What is a fair test?
An experiment in which one independent variable is tested by keeping all other independent variables the same.
400
Why do you think Juanita decided that this is not the best way to figure out how to improve her glider?
This is because she did not take her location or the length and width of the glider into perspective.
400
Annessa designed an experiment to study how temperature affects the 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?
Liver mass, enzyme amount, and reaction duration.
400
Lewis wanted to know whether a new brand of shoe could make a basketball player jump higher. He found 18 basketball players who started using the shoes this season and measured how high each player could jump in the new shoes. What error did Lewis make in his investigation?
There was no control group for the study
500
What is an independent variable?
A variable that is isolated for study and experiment that the experimenter manipulates.
500
What is a control group?
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
If you were Juanita, which of the three variables would you test first and why?
The weight, tail length, and wingspan.
500
How does the scientific community confirm that a scientist's work is valid?
Other scientists carry out the same experiment to see if they get the same results.
500
Paco wants to find out whether the baseballs used in his league fly farther than the baseballs used the year before. He has noticed that many more home runs have been hit this year than last year, so he thinks new balls have more bounce. Paco wants to design an experiment to test this idea.
If new baseballs have more home runs then it will lead to more home runs.