In an experiment, the variable that the researcher is testing, and changes on purpose is called the _____________.
Independent variable.
100
Steve was given a set of 5 metal cubes. He calculated the densities of each to determine the type of metal in each. The densities were really close to each other, so he asked his friend Robert to do the same experiment and see if he gets the same results.
Repetition or Replication?
Replication
100
In a controlled experiment, the “boring” or “normal” group that does not receive the independent variable is called the
A. constant group
B. control group
C. experimental group
D. inference group
B. Control Group
100
A good hypothesis: ____________.
A. must be proven true at the end of an experiment
B. needs to be testable
C. is never based on your observations
D. is not part of the scientific method
B
100
A scientific theory ____________.
A. is based on a vast amount of testing and data
B. is the same as a guess
C. is the same thing as a scientific law
D. is an untested idea
A. is based on a vast amount of testing and data
200
The variable that the researcher is measuring in an experiment is called the ______________.
Dependent variable.
200
Dr. Smith goes to a physics conference and hears another scientist give a talk about an experiment with nuclear materials. He decides to go back to his lab and do the same experiment. Repetition or replication?
replication
200
In a controlled experiment, factors that stay the same for all groups throughout the experiment are called:
constants
200
Dr. Jones attends a biology meeting to give a talk about his most recent research project. This is an example of
A. forming a hypothesis
B. communicating results
C. making a prediction
D. analyzing results
B. communicating results
200
True or false: Once a scientific theory has been tested enough times, it becomes a scientific law.
False
300
A researcher is testing how energy drinks affects people's heart rate. People in group A drink an energy drink and have their heart rate tested 10 minutes later. People in group B drink water and have their heart rate tested 10 minutes later.
What is the independent variable in this experiment?
energy drink
300
Bob drops his whirligig 5 times and measures the time it takes for it to fall each time. Repetition or replication?
repetition
300
A researcher is testing how energy drinks affects people's heart rate. People in group A drink an energy drink and have their heart rate tested 10 minutes later. People in group B drink water and have their heart rate tested 10 minutes later.
What is the control group in this experiment?
Group B - the group that drinks water.
300
A scientific explanation for a set of observations that can be tested in ways that support or reject it. Sometimes known as an "if/then statement"
Hypothesis
300
Which statement is NOT true about a scientific law?
A. It can be written as an equation.
B. It's a rule that describes a pattern in nature
C. It started out as a scientific theory, then became a law
D. It depends on vast amounts of data
C. It started out as a scientific theory, then became a law
400
You decide to test a new sunscreen. You put your old sunscreen on one arm, and the new sunscreen on the other arm. After 2 hours in the sun, you compare how red each arm is. In this experiment, what is the dependent variable?
red color (sunburn) on arms.
400
Sara counts the number of different bird songs she hears in a meadow each day for 10 days. Repetition or replication?
Repetition
400
In a controlled experiment, how many variables does the researcher test?
one
400
What are the three main branches of science?
Life science, Physical Science, Earth Science
500
Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. What is the independent variable? Dependent variable?
Independent variable = age of students
Dependent variable = time to assemble puzzles
500
Your lab group builds a whirligig exactly like the one another lab group builds. You measure the drop time of the whirligig.
replication
500
In a controlled experiment, the group that receives the independent variable is called the ______________ group.
Experimental
500
What is usually the last step in the scientific method?
Communicate results.
500
Put these steps of the scientific method in order: communicate results, test hypothesis, ask a question, make a hypothesis, analyze results
Ask a question, make a hypothesis, test hypothesis, analyze results, communicate results.