Variables
Data
Hypothesis
Graphs
SURPRISE
100
What is the independent (or manipulated) variable?
the variable that is changed
100
What is quantitative data?
Data that can be measured...an amount or QUANTITIY.
100
What is the proper format for a hypothesis?
If (I.V.) is related to (D.V.) then...(prediction)....because...(prior knowledge/basis).
100
What does a line graph show?
a relationship between two actions/variables
100
What do you do if your hypothesis is refuted?
Ask another question and investigate again.
200
What is the dependent (responding) variable?
The variable that responds to the change
200
What is qualitative data?
Data that describes the characteristic (or QUALITY) of something.
200
How is a theory different from a hypothesis?
A theory is a well supported broad range idea and a hypothesis is testable for a specific scenario.
200
When is a bar graph used?
to show a comparison among different categories
200
What is the difference between and inference and an observation?
inference is an educated guess and an observation is fact.
300
What is the controlled variables?
the variables that are held constant between the two test groups.
300
How do you set up a data table?
I.V. in the first column and the D.V. in the second column.
300
What is a null hypothesis?
a statement that shows not relationship between the independent and dependent variables
300
How is the scale determined for the graph?
highest value needed/number of spaces available
300
What drives the nitrogen cycle?
Radiant energy from the sun
400
What are the two test groups in a controlled experiment?
control group and an experimental group
400
How does the data table relate to the graph?
the I.V. is the x-axis and the D.V. is the y-axis
400
Form a hypothesis for the following statement- Echinacea has an effect on the duration of a cold.
If Echinacea is related to lowering the duration of a cold, then an increase in Echinacea will decrease the duration of a cold since Echinacea supports the immune system.
400
What MUST be present on all graphs?
title, units, labels, equal scale for each axis, key (legend)
400
What is the difference between the control group and the controlled variable?
control group is a test group kept in normal conditions and the controlled variable(s) are the variables held constant (the same) between the two test groups.
500
Identify the variables that would test the following scenario: Ms. Yacim noticed that when she puts olive oil on her hands she does not get dry skin in the winter. What would be the controlled variable(s) for your experiment?
Olive oil = I.V. Dry Skin= D.V. Controlled variables= same temperature, same amount of washing, same exposure to the wind.
500
Write a hypothesis for the following data Height in Centimeters
Red light Green light Blue light White light
2 1.4 1.8 1.8
If light color is related to plant growth, then red light will increase the growth the most since plants can best absorb red wavelengths of light.
500
Create a null hypothesis for the following relationship: water is related to plant growth
If water is not related to plant growth, then increasing the amount of water will not effect plant growth because water is not needed as a resource for plants.
500
What is the IV? What is the DV?
IV: salinity
DV: temperature
500
What law explains why the amount of carbon on our planet remains constant?
Law of Conservation of Matter