Repetition vs Replication in Science Experiments

The BEST reason another scientist is unable to replicate an experiment...

• They did it wrong.
• They had variables that were not controlled.
• They didn't follow the procedure.
• They measured wrong.

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Scientists have MANY trials so their results are 

• countable
• graphable
• reliable
• hard to understand

When a another scientist does someone's experiment to see if the results are valid?

• repetition
• replication
• experimental method
• controlled variable

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

• Scientists often ask each other for help in performing experiments.
• Replication of experiments helps to confirm and verify results.
• Scientists frequently perform other scientists’ experiments in order to practice their technique.
• Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

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NGSS.HS-LS4-1

Caira reads in a science journal that replication and repetiton are so important, but she did not understand the  difference between them. Which of the following best explains the two terms?

• Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.
• Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.
• Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.
• 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.

Dr. Smith has been reading about another scientist’s research in a physics journal. He plans to do these experiments himself and see if he gets the same result.

• repetition
• replication

Josue goes to Silver River each week for 4 weeks and collects 5 samples of water to test the pH.

• repetition
• replication

An environmental group contacts Nina to get her procedures so that they can check her results.

• repetition
• replication

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NGSS.MS-LS2-4

Kevin was mixing a batch of glue and borax solution to make silly putty and discovered a new substance that glows in the dark. He gave Ja'nay his specific amounts of ingredients and the steps of his procedure. He asked Ja'nay to try the experiment to see if she gets the same results.

• repetition
• replication

Haylena baked chocolate chip cookies that wound up looking like muffins. She asked Lunelka to use the same directions and see if her cookies also look like muffins.

• repetition
• replication