Transcript Proper Hypothesis

Proper Hypothesis
If and Then Statement
Ex) If someone exercises then their breathing
rate will increase.
Ex) If a cube of potato is put in salt water then
the mass of the potato will increase.
Identify the Independent vs.
Dependent Variable
• Independent Variable: The activity that is
being varied.
Independent Variable: on the left of the data table.
Will be on the X axis on the graph
• Dependent Variable: The data that results
from the independent variable
Dependent Variable: on the right side of the data table.
Will be on the Y axis on the graph.
Procedure
1. Get a russet potato, corer, and cutting board.
2. Take a core sample of the potato by pushing the
core in through the center and pulling out.
3. To get the core out of the corer push the round
dowel through the center or the corer.
4. Take the core of potato and cut it to equal 10 cm
5. Weigh piece of potato in grams on digital scale.
6. Record results in the data table
7. Make a solution of salt water.
8) Add 100g of salt to 50mL of tap water
9) Put the 10cm piece of potato in the salt water.
10)Leave potato in water for 8 hours.
11)Remove potato from water.
12) Weigh potato in grams on the scale
13) Record the weight in data table
14) Make observations and record
Independent vs. Dependent Variable
• Independent Variable: The activity that is
being varied.
• Potato lab: Percent Salt Solutions
• Dependent Variable: The data that results
from the independent variable
• Potato Lab: Mass of the Potato Pieces
Data Table - Potato
Salt Water
Solution
In Percent
Salt
15
20
30
Initial Mass
Mass in
in g
Grams After
Being in Salt
Solution
30
36
31
38
34
50
Independent
Variable
Dependent
Variable
Percent
change in
mass of
potato
20
22
47
Graph % change
A Graph needs
1. Title the graph
2. Label the X & Y axes
3. Numbers need to be in the correct numerical
order
4. Needs a key
5. Data points need to be an X with a circle
around it
6. Colors are ok
Potato Turgidity in Salt Water
50
45
40
Percent Change
35
30
25
% change
20
15
10
5
0
15%
20%
Salt Solutions
30%
Conclusions or Evaluation
• Describe how you would make changes to the
procedure or the activity. Or how you made
changes while you were doing the activity.
• Evaluate your results….Look at the data and
see if you see any patterns or irregularities
and comment on them.
• Restate your hypothesis and tell whether it
was right or wrong.
Experimental Errors
• These are not errors that you made!!!
Think outside the box!
These are things that can influence your
results without you doing it.
Breathing Rate:
Potato:
C3
1) Interpret and evaluate experimental
observations and data. Graph and explain
2) Identify sources of experimental Errors
C4:
1) Plan investigations
2) Evaluate experimental observations
3) data