Experimental
Design and Metrics Review 9/09
Integrated
Science 1 Name: KEY Per:
Review for the test on Experimental Design and Metrics (test date: ) by completing the practice activities below.
I. Experimental
Design
1. Read the following experimental scenario then
complete the questions below.
Ten seeds were planted in
pots that contained 500g of ÒPeteÕs Potting SoilÓ. The pots were given the
following amounts of distilled water each day for 40 days: Pot 1- 50 ml, Pot 2
– 100ml, Pot 3 – 150ml, Pot 4 – 200ml, Pot 5 –
250ml. Because Pot 3 received the
recommended amount of water, it was used as a control. The seeds were kept in optimum temperature
and sunlight conditions. The
height of each plant was measured in cm. on day 40.
a. On a separate sheet of
paper, create an experimental organizer of the experiment above.
Title:
The effect of water amount on plant growth
Hypothesis: If plants are given 150 ml of water per day, then
they will grow taller than plants given other water amounts. The other plants
will grow best in the following order: 200ml, 100 ml, 50 ml, then 250 ml
Independent Variable I.V:
Water Amount (ml) given to plant
à Continuous data
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Levels of I.V. (2 or more plus the
control, which must be identified) |
50 ml |
100 ml |
150 ml (control) |
200 ml |
250 ml |
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Number of trials you will
conduct for each I.V. level |
10 seeds |
10 seeds |
10 seeds |
10 seeds |
10 seeds |
Dependent Variable:
Quantitiative: Plant
Height (cm) on day 40
Qualitative: Plant Health (or other)
Constants:
Temperature, sunlight, soil type, soil amount, É
b. On your separate sheet of
paper, use a ruler to create a final-draft quality data table for the
experiment described above.
Be sure to label the data
table correctly!
The Effect of Amount Watered On Plant Height
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Water Amount
Given to Plant (ml) (I.V.) |
Plant Height
on Day 40 (cm) {D.V.} |
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Trial # 1 |
#2 |
#3 |
#4 |
#5 |
#6 |
#7 |
#8 |
#9 |
#10 |
Mean Height (cm) |
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50 ml |
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100 ml |
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150 ml |
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200 ml |
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250 ml |
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c. On your separate sheet of
paper, create a blank graph that you would use for the experiment above.
Follow all rules of graphing.
GRAPH:
Title: The
Effect of Amount Watered on Plant Height
X-Axis =
independent variable ÒAmount Watered (ml)
Y-Axis =
dependent variable = Ò Plant Height on Day 40 (cm)
Type of Graph? Is data continuous or discontinuous??? Continuous
= LINE
II. Metrics Practice. You may use a calculator, but show your work!
28.3 m 10.9 km 49.1 kg .020
III. Data
Tables, Graphing, and More.
The Effect of Compost Amount on Plant Height
Be sure to review:
- Experimental Organizers
- Data Table Design
- Rules of Graphing
- Laboratory Report Format
Note: A good Introduction includes a minimum of 3 paragraphs: 1) WHAT:
background research, 2) WHY: purpose, importance, and 3) HOW it is expected to
go: explain the Hypothesis. A good
Discussion includes a
minimum of 3 paragraphs: 1) WHAT happened, 2) WHY it happened, and 3) HOW the
experiment could be improved. A
good Conclusion
includes: 1) The key RESULT of the experiment in 2) relation to the HYPOTHESIS.