parts of a lab 10/15/2012 pages 29-30 know: what are the parts of a lab?
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Parts of a Lab10/15/2012pages 29-30
Know: What are the parts of a lab?
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InformationClarifying ?s
Testable Question- Question which builds the labWhat happens to macroinvertebrates when the water temperature decreases?
Hypothesis- Predicting what may happen**Must be stated as “If…then…because…”If the water temp decreases, then the number of macroinvertebrates will decrease because they cannot survive in cold water.
1. Begin w/ testable question
2. Formulatehypothesis
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InformationClarifying ?s
a) Manipulated Variable (Independent)- variable you change“IF” part of the hypothesis.If the water temp decreases…
b) Responding Variable (Dependent)- variable you measure or observe“THEN” part of the hypothesis.…then the number of macroinvertebrates will decrease…
3. Design lab& choosevariables
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InformationClarifying ?s
-Decide what will be necessary to conduct the experiment and write out a list of materials.3 Buckets, water, 1500 macros (500/bucket), thermometer, ice, heater
-Write detailed step-by-step instructions for others who might duplicate the lab.1. Fill each bucket with water2. Add 500 macros to each bucket3. Add ice to one bucket…etc, etc
-Repeat Steps 1-? to verify validity.
4. Materials
5. Procedure
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InformationClarifying ?s
Data- facts, figures and other evidence gathered through making observations-Analyze the data using tables or graphs to see if there are patterns(See examples of tables and graphs)
6. Begin lab,collect andanalyze data
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Water Temp (°C)
# Macroinvertebrates
16 390
13 450
10 475
Table 1. Number of macroinvertebrates.
Tables and GraphsExample 2.
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16 15 14 13 12 11 10
Water Temp (°C)
# M
acro
inve
rteb
rate
s
Graph 1. Number of macroinvertebrates.
X axis
Y axis
Resp
on
din
g/D
ep
en
den
t V
ari
ab
le(T
hen
)
Manipulated/Independent Variable(If)
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InformationClarifying ?s
Conclusion- a statement that sums up and explains what you have learned from a lab. -Does your data support your hypothesis?-Using your data table, add to your conclusion the high & low data points. Include the amount of increase/decrease.
7. MakeConclusions/Explanations
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InformationClarifying ?s
The hypothesis (was) was not supported based on the following data 16°C= 390 macros, 13°C= 450 macros and 10°C= 475 macros. The macros increased by 85. This could be due to macros cannot survive in hot water.
Final conclusion
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Evidence
Think about the macroinvertebrate data we and Mrs. Graves’ classes will collect over the year.
Come up with the following:Testable QuestionHypothesis
*remember- “If…then…because…”
Summary
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2009-2010
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October November January February March
Sampling Month
# M
acro
s
0
3
6
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12
15
18
Air
Te
mp
(°C
)
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Number of Macroinvertebrates
0
100
200
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400
500
600
16 15 14 13 12 11 10
Water Temp (°C)
# M
acro
s
X axis
Y axis
Resp
on
din
g/D
ep
en
den
t V
ari
ab
le(T
hen
)
Manipulated/Independent Variable(If)