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Unformatted text preview: Stat-332 Short Solutions to Assignment 1 1. (a) Replication: Each treatment is applied to several experimental units. Replication helps to reduce sample error and improves the precision of treatment effects. 1. (b) Randomization: Experimental units are randomly assigned to treatments. Random- ization reduces the risk of confounding by unknown explanatory variables. 1. (c) Blocking: Blocking means forming groups of homogeneous experimental units in which unknown variables other than those that define the treatment is held fixed while different treatments are applied to the units within the group. Blocking prevents confounding due to those unknown variables held fixed within the block. Blocking also improves the precision of the conclusion. 2. (a) Response: burning time of flare. Factor: type of torch design, with two levels type 1 and type 2. Treatments: same as factor levels for single factor design....
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- Spring '09