Homework3_S11

Homework3_S11 - STAT 496, Spring 2011 Homework Assignment...

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STAT 496, Spring 2011 Homework Assignment #3, Due by Thursday, February 10 1. An important quality characteristic in the manufacture of pulp used in paper is the pulp brightness. Pulp brightness is measured with a reflectance meter. Each of four shift operators makes five pulp hand-sheets from unbleached pulp. Reflectance is measured for each of the hand-sheets using the reflectance meter. Each operator measures the hand-sheets she/he has made. The data are given below and the JMP analysis appears at the end of this homework assignment. Operator O1 O2 O3 O4 60.3 59.8 60.7 61.0 60.0 60.2 60.7 60.8 60.1 60.4 60.5 60.6 60.2 59.9 60.9 60.5 59.8 60.0 60.3 60.5 Mean, i Y 60.08 60.06 60.62 60.68 Variance, 2 i s 0.037 0.058 0.052 0.047 a) Explain briefly why this is an observational study? b) Comment on the plot of the data. Be sure to discuss both center and spread. c) Calculate, by hand, the value for the Least Significant Difference (LSD) using t=3. Indicate which pairs of operators have differences in mean reflectance that are statistically significant. d)
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Homework3_S11 - STAT 496, Spring 2011 Homework Assignment...

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