Transcript Bell Ringer  What is an IV? Describe…  What is a DV? Describe…

Bell Ringer
 What is an IV? Describe…
 What is a DV? Describe…
INQUIRY UNIT
HOW TO . . .
Understand Variables:
Independent
Variable
Action
Dependent
Variable
Observable or
Variable changed on
measureable response
purpose BY
to the independent
experimenter
variable change
Example
Height of ramp
Time down ramp
Constants
All factors
that remain
the same
ramp, car,
release
point
Write a Problem Statement
(testable question ):
MUST
The question _____
be open ended and include
INDEPENDENT
DEPENDENT
the _________
and __________
variable
Use ONE of the following formats…
IV
(1) “What is the effect of_____________
DV
on____________?”
Ex:
What is the effect of
height of ramp
on
time down ramp
Problem statement (testable question) con’t
OR
IV
(2) “How does changing _____________
affect ____________?”
DV
Ex: How does changing the height of ramp
affect the time down ramp ?
Your turn…
Write a Hypothesis:
IF
THEN
An ___…,
_____…statement
that is based on what you
believe will happen or how the problem will be answered.
This belief is based on research, observations or previous
knowledge.
Use the appropriate of the following formats. . .
If the
IV is (increased/decreased) then the
will (increase/decrease/stay the same)
Ex: If the height of ramp is increased then the
will increase.
time down ramp
DV
Write a Hypothesis (con’t)
OR
If the IV is changed from ___ to ___ to ____ then the
DV is (increased/decreased/stays the same)
If the type of ramp is changed from tile to wood to carpet
then the time down ramp is increased.
Your turn. . .
Materials & Procedure
Materials: List of needed items.
Ex: ramp, car, stopwatch, meter stick , tape
Procedure: Step by step directions
Ex: 1) Gather materials
2) Mark starting point on ramp with tape, measure one meter
from end of ramp and mark stopping point with tape
3) Set up ramp so it is 5 cm high
4) Release car and start stopwatch at same time, stop the
stopwatch when the car reaches the end point.
5) Repeat four more times.
6) Repeat steps 3-5 for ramp at 10 cm high
7) Repeat steps 3-5 for ramp at 15 cm high.
Write a Title for Tables and Graphs
 The title should be descriptive of what is in the data table
and graph.
The title should be the SAME for BOTH data table and graph
The title should follow one of the following formats (same format
as the problem statement)
“How the
IV
affects the
Ex: How the height of ramp
DV
“
affects the
time down ramp
Write a Title for Tables and Graphs (con’t)
OR
“The Effect of
IV on the
DV ”
Ex: The effect of height of ramp on the time down ramp
Your turn. . .
Create a Data Table
1)
2)
3)
4)
5)
6)
7)
Create a table with three columns, center column
being wider than the other two
Label the left column with the IV and unit
Label the center column with the DV and unit
Divide center column into 5 columns and label with
trials 1-5
Label right column with the Average DV and unit
Fill in the IV column with the levels of IV
Write the title for the data table
create a data table (con’t)
Title
Dependent
Average
Independent
Variable (unit)
Dependent
Variable
Trial Trial Trial Trial Trial Variable
(unit)
1
2
3
4
5
(unit)
create a data table -- example
The effect of height of the ramp on the time down the ramp
Height of
Ramp
Trial
(cm)
1
5
10
15
Time down ramp (s)
Trial
2
Trial
3
Trial
4
Trial
5
Average
time
down the
ramp (s)
As the data is collected, write the numbers in the table.
After all the data is collected find the average (mean).
Create a Graph
 Must have:
(1) Title-same as table
(2) The variable for each axis
(3) Unit of measure for each axis
(4) Data
 The Independent Variable goes on the x/horizontal axis
 The Dependent Variable goes on the y/vertical axis
 The intervals must be equal and the LINES are numbered!
create a graph (con’t)
 Use appropriate type of graph

BAR - used…


to show comparison
LINE – used…
when both variables are numerical and continuous
 to show change over time

 ALWAYS graph the average (mean)
create a graph (example)
Bell Ringer
 When writing a title for a graph/data table…what do
we already have written that we can use to help us
write a title?
 Write the TWO formats.
Determine the Trend
Trend:
Pattern between the independent and dependent
________
variable: how one factor affects the other.
Ex: As the height of the ramp increased the time down the
ramp decreased
Write the Conclusion
Conclusion:
State if the hypothesis was supported or not, describe
the trend and give evidence of why the hypothesis was
supported or not supported directly from the data and/or
research.
At least three sentences:
1…State if the ______supported
or did not support
data
the hypothesis
trend
2…State the________
evidence
3…Give __________to
support the trend
Conclusion -- example
The data supports the hypothesis. As the height of
the ramp increased the time down the ramp decreased.
When the height of the ramp was 5 cm high the car took 3
seconds to travel down the ramp, but when the height was
increased to 10 cm the car only took 2 sec to roll down the
ramp. Finally, when the ramp was increased to 15 cm the
time further decreased to only 1.5 seconds for the car to roll
down the ramp.
Mr. Lee Rap
 http://www.youtube.com/watch?v=spDG4ApV82U
&feature=related