parts of a lab 10/15/2012 pages 29-30 know: what are the parts of a lab?

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.

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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)

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

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350

October November January February March

Sampling Month

# M

acro

s

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3

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18

Air

Te

mp

(°C

)

Number of Macroinvertebrates

0

100

200

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600

16 15 14 13 12 11 10

Water Temp (°C)

# M

acro

s

X axis

Y axis

Resp

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din

g/D

ep

en

den

t V

ari

ab

le(T

hen

)

Manipulated/Independent Variable(If)