Independent Variable
The variable that is purposely changed by the scientist
What is the independent variable?
The variable that is measured during an experiment.
What is the dependent variable?
When different scientists repeat an investigation using the same procedures.
What is replication?
When the same scientist performs multiple trials of an experiment.
What is repetition?
Information collected during an investigation.
What is data?
In an experiment testing different amounts of water on plant growth, what is the independent variable?
What is the amount of water?
A student changes the amount of sunlight and measures plant height. What is the dependent variable?
plant height
Why are scientific investigations expected to be replicable?
So other scientists can verify the results.
Why should scientists repeat trials?
To improve accuracy and reduce error.
Scientific conclusions should be based on this, not opinions
What is evidence?
A student tests three brands of paper towels. What is the independent variable?
What is the brand of paper towel?
A scientist changes fertilizer type and measures flower production. What is the dependent variable
number of flowers
Another school performs the same experiment and gets similar results. This is called ______.
What is replication?
A student rolls a toy car down a ramp five times and records the distance each time. This is an example of ______.
What is repetition?
The process used to answer scientific questions.
What is an investigation or experiment?
Why should only one independent variable be tested at a time?
So
scientists know what caused the results.
he dependent variable depends on changes in which variable?
What is the independent variable?
Replication increases confidence in what?
Results or conclusions
Repeated trials help identify unusual results called ______.
What are outliers?
Scientific knowledge changes when scientists discover new ______.
What is evidence?
Identify the independent variable: A scientist changes the temperature of water and measures how much sugar dissolves.
What is water temperature?
Identify the dependent variable: Students test different liquids and record how fast a tablet dissolves
Dissolving time
What must scientists provide so others can replicate their work?
What are clear procedures?
A scientist conducts ten trials before making a conclusion. Why?
To make sure results are consistent and reliable.
Which investigation is more reliable: one trial or multiple repeated and replicated trials?
What are multiple repeated and replicated trials?