Repetition, Replication, and Credibility of Sources

When another scientist does someone's experiment to see if the results are valid, it is called ___________.

• repetition
• replication
• experimental method
• controlled variable

During replications, others have to follow the same procedures to get the same output or results. True or False?

• True

• False

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-5

Daniel and Alex are both scientists. Daniel conducts an experiment testing different fuel sources for cars in the future. Daniel conducts each test three times in order to compare his data. After he finishes the trials, Daniel showed Alex his results from each trial. Alex is confused about Daniel’s results, so he decides to conduct the experiment for himself. Which scientific process did each scientist use?

• Alex and Daniel used each others data to compare their results.

• Alex and Daniel used the same hypothesis to compare their results.

• Daniel used repetition in his experiment while Alex replicated Daniel's experiment

• Daniel used replication in his experiment while Alex used repetition to conduct Daniel's experiment.

Experiments are often repeated many times by the same or different scientists. What is the most important reason why more than one scientist should conduct an investigation using the same methods?

A. If the results are the same, replication of the investigation helps to confirm the results.

B. The competition makes the scientists work more carefully.

C. More than one scientist is interested in the problem.

D. Different scientists might perform the experiment differently.

• A

• B

• C

• D

What is the BEST reason you must always repeat an experiment?

• Make sure your data is consistent and accurate.

• Make sure your data supports your prediction.

• Make sure your experiment is easy to do.

• Make sure your experiment has lots of data.

Which statement is necessary in order for a scientific investigation to be valid?

• The investigation must be able to be repeated by others.

• The investigation must produce data that can be graphed.

• The investigation must follow all the steps of the scientific method.

• The investigation must have a conclusion that matches the prediction.

What should be considered when evaluating the author of a source?

• The author’s credentials (experience in the field or at a university).

• If the author has written about the topic somewhere else.

• The types of organizations, research-based or commercial-based, in which the author may be associated.

• The author's appearance and confidence level.

When can we say that a website is valid and reliable?

• The website’s author is clear, and the date is recent.

• The website contains errors in spelling.

• There are lots of advertisements on the page.

• The

  hyperlinks to other websites are not working.

The website includes lots of evidence from university studies; it must be an unreliable resource.

• True

• False

Which statement is necessary in order for a scientific investigation to be valid?

• The investigation can be replicated by others.

• The investigation must produce data that can be graphed.

• The investigation must follow all the steps of the scientific method.

• The investigation must have a conclusion that matches the prediction.