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WorksheetsSC.5.N.1.3 - Need for repeated trials.
Total questions: 15
Worksheet time: 28mins
What is the BEST reason you 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
One of the ways you can make sure your results are valid is....
to have more than one independent variable
to do repeated trials of your experiment
To only record data that supports your hypothesis
to change your hypothesis after the experiment
Janna has offered her canary, Sammy, a choice of sunflower seed or ground corn for two months. She has observed that Sammy eats more sunflower seeds than ground corn during the two months. She concludes Sammy prefers sunflower seeds over ground corn.
What should Janna do if she wants to confirm her results?
Repeat the experiment with her friend's bird.
Repeat the experiment using different food containers.
Repeat the experiment with the same exact conditions.
Repeat the experiment with another feed instead of corn.
Allison is studying constellations. On a clear night, she sketches the constellations she sees at different times. She concludes that the constellations appear to move in the
night sky. If this conclusion is correct, what should happen if Allison repeats the investigation?
She should reach a new conclusion
She should make similar observations
She should choose different constellations
to study.
She should form an opinion about her favorite
constellation.
Edena compares the time of one back-and-forth swing for each of five pendulums. She concludes that the longest pendulum swings back and forth the most slowly.
However, she does not record the lengths of the strings, the times, or the masses she uses.
What is the best reason that the results of Edena’s experiment are not very useful?
She did not decide if her hypothesis is supported.
She did not write down a prediction before beginning.
The experiment cannot be repeated to confirm her results
The experiment should have tested different types of string
Lauren is investigating the way plant stems transport liquids. She puts a white flower in a glass of water and then adds red food coloring to the water. She concludes that the
colored water moved up the stem to the flower petals. If the conclusion is correct, what should happen if Lauren repeats the experiment?
She should get the same results
She will follow a new procedure
She should use a different kind of flower
She will probably make different observations
Avi is comparing two brands of batteries. He uses two identical flashlights to see which battery lasts longer. What is the best reason for this experiment to be repeated?
to check whether the results are consistent
to make sure the flashlights were not broken
to check that no one turned off one of the flashlights
to make a prediction about a different brand of battery
Trials must be (a) many times in order to find patterns
Thomas and Julie wanted to find out which material would insulate their teacher's coffee cup and keep the coffee hot for the longest period of time. They first wrapped her cup with bubble wrap and recorded the temperature of the coffee once every 15 minutes for 2 hours. They repeated the investigation, this time using newspaper instead of bubble wrap, but they got the same results for both materials.
What could they do to make sure their results are valid?
Repeat their experiment.
Use teas instead of coffee.
Use a different thermometer.
Conduct their investigation in a colder room.
What should they do to check their results?
The number of times an experiment is repeated.
Independent variable
Constants
Sample size
Trials
Reggie and Marissa decide to measure the number of stairs a spring toy can travel down. Reggie tries first. Before he tells Marissa what he measured, however, he tries the experiment three different times. When Marissa asks about the result, he tells her the average of his three trials, and the range of his 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 see how consistent or inconsistent his results were.
He needed to see how the fundamental principle he was studying changed.
Repetition is when one scientist
copies another scientist's experiment.
bumps into another scientists.
repeats their own experiment several times.
clones a T. rex.
