例4.3.1 设发电量Y1,工业总产值Y 2与钢材产量x1,水泥产-|||-量x2,机械工业总产值x3,棉纱产量x4,机制纸产量x5之间有线性-|||-相关关系.现收集了1949到1978年共30年的数据(见表4.2).试-|||-:x,(x)_(1)(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),(x)_(3),{.-|||-表4.2发电量与经济发展数据-|||-年 x1 x2 x3 x4 Y1 Y2-|||-1949 0.9 0.8 0.14 6.63 0.24 1.47 7.31-|||-1950 1.0 2.1 0.15 7.07 0.46 1.25 7.42-|||-1951 2.9 6.3 0.33 7.60 1.02 2.05 11.13-|||-1952 5.0 4.4 0.78 12.88 1.61 2.49 16.08-|||-1953 8.2 13.3 1.18 15.86 1.63 3.16 22.86-|||-1954 13.1 16.8 1.56 18.79 1.93 3.87 29.52-|||-1955 23.8 17.8 2.11 14.63 2.31 4.50 34.54-|||-1956 34.8 27.8 3.09 19.79 3.32 6.09 41.22-|||-1957 35.4 22.1 3.58 16.50 4.44 6.78 47.54-|||-1958 47.0 32.2 7.31 26.22 7.18 10.73 60.00-|||-1959 62.6 33.2 9.61 28.00 8.77 17.65 78.00-|||-1960 68.0 55.6 12.85 27.56 9.89 26.84 96.20-|||-1961 35.3 24.4 6.76 10.95 5.58 24.20 52.37-|||-1962 31.3 17.9 5.08 10.15 6.03 20.08 37.77-|||-1963 35.2 24.8 5.54 14.23 7.18 19.28 40.07-|||-1964 45.3 37.8 7.14 20.38 8.80 22.89 50.36-|||-1965 49.5 78.8 11.20 26.56 10.45 28.94 65.33-|||-1966 59.7 101.6 15.89 33.18 12.51 39.05 83.64-|||-1967 47.8 74.9 10.86 23.90 11.42 39.09 68.16-|||-1968 17.7 40.2 5.10 17.56 9.03 26.81 41.64-|||-1969 36.0 73.3 13.14 27.20 8.05 37.19 67.30-|||-1970 62.0 138.6 25.54 36.28 10.30 54.09 103.57-|||-1971 97.0 247.0 ,31 41.53 14.18 77.39 135.80-|||-1972 95.2 270.0 28.79 40.24 15.19 84.02 118.10-|||-1973 118.4 233.5 28.03 38.20 15.77 88.39 119.62-|||-1974 99.9 205.0 26.50 31.54 12.29 86.32 112.39-|||-1975 151.0 288.0 38.61 46.87 17.36 107.94 144.41-|||-1976 108.0 262.2 31.46 38.62 15.10 102.76 130.66-|||-1977 162.5 358.6 46.21 52.48 20.48 118.84 175.10-|||-1978 238.2 454.8 55.86 55.96 26.40 139.30 214.44