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Unformatted text preview: Variability 11/02/2008 08:10:00 Types of Judgment Subjective: judgments made based on the opinion of the observer o B&W photographs are more artistic than color photographs o Condenser enlargers are better than diffusion enlargers Because they are opinion they cannot be right or wrong Objective: Based on some type of measured data o For example: Measurement of the density on a print CIELAB values of a pixel Tristimulus values of a sample o Caution: One cannot make a conclusion based on one measurement Variability No two things are ever the same If you base you decision on one observation only, you cannot come to the wrong decision Sources of Variability Chance cause o A perfect die has the same chance of the numbers 1-6 being rolled Assignable cause o A weighted die will land on a specific number each time o You can assign the outcome to a specific cause and action can be taken to correct it Patterns Cannot predict the outcome of a chance causable event There is an underlying pattern of variation over the long term Types of patterns o Rectangular Distribution o Triangular Distribution o Normal or Bell Shaped Distribution Rectangular Actual distribution only approximates the expected or theoretical results Obtaining a result that has an observable bias indicates that there is an...
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This note was uploaded on 04/21/2008 for the course M&P 072 taught by Professor Salvaggio during the Winter '07 term at RIT.
- Winter '07