Variables
What is the independent variable
the variable that you change
what is a hypothesis
A prediction that can be tested
What graph is used for no continous (word) data
Coloumn graph
What graph is used for continous (number only) data
Line graph
What should the conclusion include
whether the hypothesis was supported or rejected & data as evidence
What is the dependent variable
The variable that you measure
Complete the hypothesis structure:
“If ________, then ________ "
Independent variable, dependent variable
Which axis does the independent variable go on?
x-axis
What is the mode?
Number that is most commonly seen
Should new information be introduced in a conclusion?
no
Why are controlled variables important?
they make a test fair
Is this a good hypothesis?
“If plants get more sunlight, then they will grow taller because sunlight is needed for photosynthesis.”
yes
Which axis does the dependent variable go on
y-axis
hat evidence should be used in a conclusion?
results/data from the investigation
If the heart rate is being measured - what variable is it
Dependent
find the median: 2, 4, 5, 7, 9
5
Identify the controlled variable:
A student tests how sunlight affects plant growth using the same type of plant, same amount of water, and same soil.
Type of plant, amount of water, soil
What should every graph include?
- title
- labelled axis
Find the range: 3, 6, 8, 10, 12
9
A student changes the amount of water given to plants and measures growth. Identify the independent and dependent variables.
Independent: amount of water
Dependent: Growth of plants
A student changes the temperature of water and measures how long sugar takes to dissolve.
Identify the independent and dependent variables.
independent: temperature of water
dependent: how long sugar takes to dissolve
A student changes the type of surface a toy car rolls on and measures the distance travelled. Identify the independent and dependent variables.
Independent: type of surface
Dependent: distance travelled
A student changes the number of hours of sunlight a plant receives and measures the number of leaves grown. Identify the independent and dependent variables.
Answer:
Independent: amount of sunlight
dependent: number of leaves grown
Write a hypothesis for an investigation testing how exercise affects heart rate.
If the amount of exercise increases, then heart rate will increase