parts of a lab 10/15/2012 pages 29-30 know: what are the parts of a lab?
TRANSCRIPT
Parts of a Lab10/15/2012pages 29-30
Know: What are the parts of a lab?
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
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
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
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
Water Temp (°C)
# Macroinvertebrates
16 390
13 450
10 475
Table 1. Number of macroinvertebrates.
Tables and GraphsExample 2.
0
100
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600
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)
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
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
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
2009-2010
0
50
100
150
200
250
300
350
October November January February March
Sampling Month
# M
acro
s
0
3
6
9
12
15
18
Air
Te
mp
(°C
)
Number of Macroinvertebrates
0
100
200
300
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)