Scientific Method / variables

SC.7.N.1.2

Scientists frequently repeat the experiments of others scientists. Why is this important in science?

a. Scientists often ask each other for help in performing experiments.

b. Replication of experiments helps to confirm and verify results.

c. Scientists frequently perform other scientists’ experiments in order to practice their technique.

d. Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

• a

• b

• c

• d

SC.7.N.1.2

Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?

a. Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

b. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

c. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

d. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

• a

• b

• c

• d

SC.7.N.1.4

Jason states the following prediction: “As the air temperature increases, the air in a balloon will expand, increasing the circumference of the balloon.”

Some of Jason’s observations during his experiment are shown below. Which of the following is the outcome variable (dependent variable) for an experiment designed to test Jason’s prediction?

a. circumference of the balloon

b. material the balloon is made of

c. length of the balloon’s string

d. air temperature

• a

• b

• c

• d

SC.7.N.1.4

Kaylee reads an article that states that the frequency of chirping by crickets is related to the temperature of their environment. She wants to conduct an experiment to see if this is true. Kaylee states this hypothesis: Crickets chirp more frequently when the temperature of their environment increases. What is the test variable (independent variable) and outcome variable (dependent variable) in Kaylee’s experiment?

a. test variable (independent variable): number of crickets; outcome variable (dependent variable): frequency of chirping

b. test variable (independent variable): temperature of environment; outcome variable (dependent variable): frequency of chirping

c. test variable (independent variable): number of crickets; outcome variable (dependent variable): temperature of environment

d.test variable (independent variable): frequency of chirping; outcome variable (dependent variable): temperature of environment

• a

• b

• c

• d

SC.6.N.1.4

Miguel and Blanca are each using a questionnaire with different groups of students to determine which flavor of juice is preferred. After administering their questionnaire, they compare their results and find that they are very different. How should Miguel and Blanca proceed?

a. They should throw out their results and start over.

b. They should decide which set of results is better and throw out the other set.

c. They should compare their methods to see if they can explain why their results varied.

d. One of the students should change their results so the two sets of results match up better.

• a

• b

• c

• d

The ____________ variable is changed in the experiement.

• Independent

• Dependent

• Control

• Operational

The _______________ variable is the one that is measured at the end of the experiment

• Independent

• Dependent

• Operational

• Constant

The independent variables is

• Changed

• Manipulated

• Consistent

• Measured

The dependent variable is

• Manipulated

• Test

• Measured

• Recorded

If I increase the ramp height the car will go faster.

What is the independent variable

• The type of car

• The Height

• The Speed

• The Distance