Home 
Laboratory Studies 
Recordkeeping,
Writing, & Data Analysis 
Laboratory Methods 

Overview Microscope studies Flagella experiment Laboratory math Blood fractionation Gel electrophoresis Protein gel analysis Mitochondria Concepts/ theory 
Overview Keeping a lab notebook Writing research papers Dimensions & units Using figures (graphs) 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 ChiSquared DistributionIf the calculated chisquared 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: For two degrees of freedom: 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 

Copyright
and Intended Use Visitors: to ensure that your message is not mistaken for SPAM, please include the acronym "Bios211" in the subject line of email communications Created by David R. Caprette (caprette@rice.edu), Rice University Dates 