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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.

Tags

NGSS.HS-PS2-5

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.

Tamer understood that reproducibility is an important part of the scientific method. Therefore, he repeated his experiment on fur color in rabbits four separate times and obtained the same result each time. However, his teacher informed him that his results had not yet been proven valid and suggested that his experiment be conducted by another student at different school. Which of the following is the best reason for this recommendation?

• The student at the other school was struggling.

• The teacher knew that Tamer had errors in his experiment.

• If Tamer’s results were replicated, they would be more valid.

• The two schools often swapped science experiments.

Tanya developed an experiment and then performed it multiple times. Ian also performed Tanya’s experiment. Which of the following best describes Tanya and Ian’s actions?

• Tanya was conducting a scientific investigation, but Ian was not.

• Tanya was looking for additional information and Ian was repeating Tanya’s experiment.

• Tanya was repeating her experiment and Ian was replicating Tanya’s experiment.

• Tanya was correcting flaws in her experiment and so was Ian.

Most hypotheses of experiments are not accepted until other scientists verify the results. Which process occurs when one scientist carries out the same procedures used by another in order to verify the results?

• repetition

• validation

• replication

• a trial

Tiffany repeated her experiment about light and color four times. Each time, she got different results and she became discouraged. However, her teacher informed her that she was working like an actual scientist. Which of the following is the best explanation for her teacher’s statement?

• The teacher did not know that Tiffany’s results kept changing.

• The teacher knew scientists always repeat experiments.

• The teacher wanted to motivate Tiffany to keep working.

• The teacher was always kind to students.

Tags

NGSS.HS-LS1-3

Dr. Yardley conducted the same experiment on plants six times before publishing her results. Dr Yourman repeated her experiment on earthworms only twice, then two independent laboratories replicated her experiment. Why are Dr. Yourman’s results more widely accepted than Dr. Yardley’s?

• Dr. Yardley repeated her experiment too many times for it to be valid.

• Dr. Yardley’s results were considered significantly more important than Dr. Yourman’s.

• Experiments on earthworms are considered more important than experiments on plants.

• Dr. Yourman’s results were replicated, and Dr. Yardley’s were not.

Results in science are not generally accepted as being accurate until they can be verified. Which of the following is an example of repetition in science?

• A scientist analyzes the data included in the published work of another scientist and agrees with the conclusions.

• A scientist poses a new question for investigation after reading the results of another scientist’s work.

• A student designs an experiment on plant growth that includes multiple trials.

• One scientist carries out the same experiment performed by another scientist to validate the results.

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

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

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

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

• Replication of experiments helps to confirm and verify results.

Dr. Taylor performed an experiment on the aggressiveness of two different species of bees. After he completed one trial of his experiment, he summarized the results and sent them to a scientific journal for publication. The journal rejected his article and would not publish it. Which of the following is the most likely reason for the journal’s?

• The journal only published articles concerning medical science.

• Scientists must do several repetitions of an experiment before its results are believable.

• Dr. Taylor wrote up his results too quickly and it was of poor-quality.

• Dr. Taylor had already published a number of articles in that publication and had reached his limit.