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065 Based on the least squares regression line, oas would Ixpsct a tract with 1005 residents. Figure 7 compares the percent of all units Ln multi-unit structures (including duplexes) to the average number age 5-17 per dwelling un/t, This figure also indicates that multiple units tend to have fewer residents of school age. The correlation coefficient in this case is -0,56, with an r2 value 0.32, a weaker relation than that of Pigure 6, but still an important predictor of school-age population. Figure S compares the average number of rooms per unit in each Census tract to the number of res/dents aged 5 to 17 per unit Ln the tract. This relation shays a very weak correlation, indicating that at least at the tract level, the average number of r~oms per unit is not I good predictor of the student generation. The correlation coefficient for this relation Ls only 0.23, r2 value 0.054, indicating only 52 of the variance Ls explained by'this factor. Hot/mating Population Age 5-17 for Housing Developments Census data suggests that housing type is strongly correlated to age structure of the resident population. Of the 67,161 dwelling units in the City tabulated in the 1980 Census, 44,121 were in single-unit structures, If the entire school-age population were ~sslgned' to'~hese s£ngie iamzly units, an average of 0.98 persons aged 5-17 would be expected for each dwelling unit. In fact, some school-aged residents are likely to live in multlple-unlt structures. The school-aged population would be expected to be less as unit size decreases, and less as number of units in the structure increases. Not 811 the school-aged population would be expected to enroll in public school. Although census data cannot provide a deflnLtive answer to the number of school-age residents expected, the following conclusions ara considered justified: Single family homes are the predominant source of school-age population, and would be expected to result in 0.7 to 1.4 students per unit, with larger unL~e expected to have larger school-age population. (2) Hulciple family unite in general would be expected to have substantially fewer school-age res/den~s, rich perhaps 0.1 to 0.4 per unit a typical rinse for most projects. (3) Large multi-unit projects would be expected co result in very few school-age residents, with perhaps 0.05 to 0.15 I typical raflBe per unit for projects of sreaCer than ~0 unite.