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Unformatted text preview: (d) Is the burning time of type 2 longer than that of type 1? 3. Two concrete types (T1 and T2) were used in the construction of two test sections (blocks) of a highway. Each test section was divided into two equal-length subsections, and T1 and T2 were randomly assigned to the subsections. After ve years, a measure of road deterioration called IRI (Inter-national Roughness Index, measured in m/km) was recorded. The values for this response variable, Y , are as follows: Treatment Section T1 T2 1 6 10 2 9 14 (a) Dene the response, factors and their levels, treatments, and experimental units. (b) Is there a dierence between the two types of concrete?...
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- Fall '09