Variables
What is an independent variable ?
The I.V is the part of the experiment that a scientist changes.
How many variables can you change in an experiment?
1 - ONLY the I.V !
What is a qualitative observation ?
An observation using your 5 senses.
What is the scientific method ?
The steps scientist take when conducting an experiment.
What is a hypothesis ?
An educated guess, or a prediction using and if then statement.
How many types of variables are there in the scientific method ?
3
Eating Breakfast in the morning increases the ability to learn in school.
What is the independent variable ?
Eating Breakfast or Not eating Breakfast
What is a quantitative observation ?
An observation using numerical data such as measurement.
Making Observations
Does sleeping 5 hours or more than 8 hours effect how well students grades are ?
Write a possible hypothesis?
If students sleep 5 hours then they will do worse in school.
If students sleep more than 8 hours then they will do better in school.
What are control variables?
This is what you keep the same in your trial or groups.
If students spend more time using Tik Tok, then they will read fewer books.
What is the D.V ?
# of books read.
A scientist listens and records the sounds a crying baby makes to see if the cries have different meanings. What kind of observation is this.
Qualitative because the scientist is using their 5 senses, hearing.
A student wanted to know if music has an effect on plant growth. Create a hypothesis for this experiment.
If music is played for a plant then, the plant will grow faster.
If music is played for a plant, then the plant will grow slower.
A hypothesis is a prediction or educated guess a scientist makes about the outcome of an experiment. True or False ?
True
What is a dependent variable ?
What happened as a result that the scientist changed the I.V.
Eating Breakfast in the morning increases the ability to learn in school.
What is the D.V ?
The amount learned in school.
Is the following statement a QL observation or QN ? Why ?
The tree is tall with green leaves.
QL - Qualitative because you use your sight. to see what color the tree is.
The second step after making observations is ?
To come up with a question
A hypothesis is written using an if, then statement. True or False ?
True
What are variables ?
Variables are all the parts of an investigation that you can change or measure.
If students spend more time on Tik Tok then they will read fewer books.
What is the I.V ?
Amount of time spent on Tik Tok
QN or QL ? Why ?
The pumpkin has a mass of 27.4 grams.
QN. Because it shows measurement.
A student wanted to know if music has an effect on plant growth. What is the independent variable ?
playing music or not
A student wanted to know if music has an effect on plant growth. Write a hypothesis for this experiment.
If music is played for the plant, then the plant will grow faster.
If music is played for the plant, then the plant will grow slower.