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Laboratory
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Recordkeeping, Writing,
& Data Analysis

Laboratory
Methods

  Overview
Microscope studies

Flagella experiment
Laboratory math
Blood fractionation
Gel electrophoresis
Protein gel analysis
Mitochondria
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Keeping a lab notebook
Writing research papers
Dimensions & units
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Examples of graphs
Experimental error
Representing error
Applying statistics
Overview
Principles of microscopy

Solutions & dilutions
Protein assays
Spectrophotometry
Fractionation & centrifugation
Radioisotopes and detection

Statistical tests

Tables

 
 

 

Selected Critical Values of the Chi-Squared Distribution

If the calculated chi-squared statistic exceeds a tabled value for the appropriate number of degrees of freedom, then observed values are significantly different from expected values at the confidence level indicated by p.

For one degree of freedom:
p=0.05, 3.84; p=0.025, 5.02; p=0.01, 6.64; p=0.005, 7.88

For two degrees of freedom:
p=0.05, 5.99; p=0.025, 7.38; p=0.01, 9.21; p=0.005, 10.6

For three degrees of freedom:

p=0.05, 7.82; p=0.025, 9.35; p=0.01, 11.34; p=0.005, 12.84

For four degrees of freedom:

p=0.05, 9.49; p=0.025, 11.14; p=0.01, 13.28; p=0.005, 14.86

For five degrees of freedom:

p=0.05, 11.07; p=0.025, 12.83; p=0.01, 15.09; p=0.005, 16.75


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Created by David R. Caprette (caprette@rice.edu), Rice University Dates