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Unformatted text preview: Stat 332 Experimental Design and Sampling Assignment 3 Due: Monday, June 15, 2009 (10:30am in class) 1. Plastic medical syringes are manufactured in an injection moulding process. The equip- ment has a temperature setting, and temperature was set at 200,210, or 220 degrees Celsius in a randomized-block experiment. The blocks were four batches of raw plastic. Each batch of raw material was divided into three sub-batches, and the three temperatures were allo- cated to the sub-batches at random. The syringes made from a sub-batch were measured, and the average deviations from nominal diameter (hundredths of a mm) are reported below. Temperature Batch 1 2 3 Total 1 1.4-1.3 -0.7-0.6 2 3.3 2.4 2.8 8.5 3 0.9 0.0 0.3 1.2 4-2.6 -2.9 -3.1-8.6 Total 3.0-1.8 -0.7 0.5 1. Why might it be useful to block this experiment? Relate your answer to the specific application. 2. Plot the data in a useful way. What does the plot suggest about the magnitudes of effects that might be either included in a model or assumed negligible?effects that might be either included in a model or assumed negligible?...
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This note was uploaded on 06/21/2009 for the course STAT 332 taught by Professor Xu(sunny)wang during the Spring '09 term at Waterloo.
- Spring '09