Replication vs. Repetition

Reggie and Marissa decide to measure the number of stairs a spring toy can travel down. Reggie tries first and tries the experiment three different times. When Marissa asks about the result, he tells her the the results from the lowest to the highest value. What would be the most likely scientific reason for Reggie to repeat the experiment so many times?

• He needed to obtain identical results.

• He needed to obtain the result he expected.

• He needed to verify accuracy and make sure his experiment was valid.

• He just wanted to have fun.

Which statement is important 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.

Replication or Repetition or Both?

You go to a neighborhood park five times and take notes on the birds you see and hear. You write up your notes.

• Repetition

• Replication

• Both

Replication or Repetition or Both?

You go to the same neighborhood park with a friend. You give your friend a copy of the notes you took when you went to the park on your own. You and your friend both take notes on the birds you see and hear.

• Replication

• Repetition

• Both

Replication, Repetition, or Both?

Your friend goes by himself to the same neighborhood park. Your friend takes notes on the birds he sees and hears.

• Replication

• Repetition

• Both

If your classmate repeat an experiment that you have already conducted, that is an example of

• replication

• repetition

One way that the quality of scientific information is evaluated is that it is reviewed by___________.

• no one

• your firend

• peer reviews

• yourself

Waldriana would like to investigate the effect of temperature on the amount of food birds eat. What should she do first to begin her investigation?

• develop a question

• design an experiment

• conduct background research

• come up with a theory

Berto writes down his hypothesis that more salt will dissolve in cold water than in warm water. He adds salt to different temperatures of water and records his observations including the amount of undissolved salt. He finds that there is more salt dissolved in warm water than cold water. What should Berto do next to make sure that his conclusion is valid?

• do another investigation with sugar

• repeat his investigation using a different liquid than water

• repeat his investigation to see if his results are the same

• change his results to match his original hypothesis

Austin is studying states of matter by heating water in a pan. Which statement from his notebook is an observation?

• I think there is air in the bubbles.

• It is hard to estimate the size of the bubbles.

• The bottom of the pan must be very hot.

• Tiny bubbles form on the bottom of the pan.