Chi-square Analysis

Chi-square Analysis - 12/30/2007 Measuring the size of a...

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12/30/2007 1 Measuring the size of a protein on an SDS-PAGE gel Get out c Ruler c Calculator (cell phone?) c Photo of gel c Electrophoresis handout c Lab manual, page 229 c CPS clicker Chi-square Analysis Get out c Your Calculator c Symbiosis -6 -4 -2 0 2 4 6 8 Yes No Rewrite Submitted? Average Percent Improvement on Circulation Paper Does completing the Enzymes paper rewrite improve your performance on future papers? -100 -80 -60 -40 -20 0 20 40 60 80 100 Yes No Rewrite Submitted? Average Percent Improvement on Circulation Paper Does completing the Enzymes paper rewrite improve your performance on future papers? Statistical Hypothesis tests c Test Null hypothesis: Null hypothesis: Differences you see are due to random error Why we need statistical tests: an example c Theory- Grading is the same in all sections of Biol100L c Prediction- Percent of students earning an A will be the same in all sections of Biol100L
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12/30/2007 2 Section # Total number students Number of A’s Frequency of A’s 101 22 11 0.50 201 23 11 0.48 301 20 11 0.55 401 22 9 0.41 501 21 9 0.43 601 25 15 0.60 801 22 8 0.37 All sections 155 74 0.48 Uneven Grade Distribution in Biol100L*? *Spring 2004 How to explain mismatch? The theory is wrong
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This note was uploaded on 03/08/2010 for the course BIOL 100L taught by Professor Claassen during the Spring '08 term at UMBC.

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Chi-square Analysis - 12/30/2007 Measuring the size of a...

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