Self Check: Scientific Method

Which of the following examples demonstrates replication?

• Joseph conducts his own experiment 25 times.

• Sarah is following another student’s written procedures for an experiment that was already performed.

• Juanita conducts her experiment 1 time.

• Matt writes the procedures of his experiment carefully and carries out his experiment.

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(SC.8.N.1.2) Repetition vs Replication

Which of the following examples shows an experiment that has been designed and conducted using repeated trials and replication?

• Addison is conducting an experiment using water. She has a friend look over the procedures before completing 30 trials.

• Amanda is conducting an experiment using aluminum foil. She completes her experiment 1 time and makes adjustments to her procedures. She then completes 20 trials of her experiment.

• Rashawn is conducting an experiment using tennis balls. He completes 30 trials and has 2 of his friends complete the experiment by following his procedures.

• Julian is conducting an experiment using rubber bands. He completes 10 trials then begins work on a different experiment.

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(SC.8.N.1.2) Repetition vs Replication

Which of the following shows repeated trials in an experiment but does NOT show replication?

• Samuel writes his own procedures and then has a friend complete 20 trials.

• Leslie writes her own procedures for her group to follow.

• Joshua conducts an experiment by following the procedures given to him by his teacher.

• Katelyn conducts an experiment that requires her to throw an object at a target 20 times.

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(SC.8.N.1.2) Repetition vs Replication

What is the independent variable in the data table above?

• the number of trials

• the number of chirps

• the number of crickets

• the temperature

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(SC.8.N.1.1) Graph Interpretation

(SC.8.N.1.1) Variable Identification

(SC.8.N.1.1) Scientific Method

What evidence supports the claim that the higher the temperature, the greater the number of chirps?

• At 25°C the average number of chirps per minute was 83, compared to 127 chirps at 20°C and 168 chirps at 15°C.

• At 25°C the average number of chirps per minute was 168, compared to 127 chirps at 20°C and 83 chirps at 15°C.

• At 25°C the average number of chirps per minute was 127, compared to 83 chirps at 20°C and 168 chirps at 15°C.

• At 25°C the average number of chirps per minute was 91, compared to 135 chirps at 20°C and 180 chirps at 15°C.

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(SC.8.N.1.1) Data Interpretation

(SC.8.N.1.3) Support / Fail to Support

Curtis conducts an investigation to determine which brand of paper towels is the most absorbent. He records his findings in the table below. What is the test variable (independent variable) and outcome (dependent variable) in this investigation?

• Test variable: the brand of paper towels Outcome: amount of water absorbed

• Test variable: the liquid used Outcome: amount of water absorbed

• Test: the amount of water absorbed Outcome: brand of paper towels

• Test: the time the towels absorbed water Outcome: brand of paper towels

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(SC.8.N.1.1) Data Interpretation

(SC.8.N.1.1) Variable Identification

What conclusion can be drawn using the data from the chart above?

• If crickets are subjected to higher temperatures then the number of chirps per minute will increase.

• If crickets are subjected to higher temperatures then the number of chirps per minute will decrease.

• If crickets are subjected to the same temperatures then the number of chirps per minute will increase.

• If crickets are subjected to lower temperatures then the number of chirps per minute will increase.

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(SC.8.N.1.3) Support / Fail to Support

(SC.8.N.1.1) Data Interpretation

(SC.8.N.1.1) Scientific Method