Announcement
                            Obs     y      x1     x2

                              1    323    100    197
                              2    326     89    211
                              3    323     86    211
                              4    321    108    189
                              5    323    101    197
                              6    323    113    185
                              7    325    106    193
                              8    325     94    206
                              9    326    101    200
                             10    325     86    215
                             11    327    116    186
                             12    325    100    199
                             13    322     97    200
                             14    324    102    197
                             15    326     91    208
                             16    326    115    186
                             17    324     77    222
                             18    325    103    196
                             19    324    102    196
                             20    325    102    197

 X1 alone
                                     Sum of           Mean
 Source                   DF        Squares         Square    F Value    Pr > F
 Model                     1        0.15647        0.15647       0.06    0.8045
 Error                    18       44.64353        2.48020                     
 Corrected Total          19       44.80000                                    
                                                   R-Square     0.0035

 
                           Parameter       Standard
      Variable     DF       Estimate          Error    t Value    Pr > |t|
      Intercept     1      323.50570        3.57789      90.42      <.0001
      x1            1        0.00899        0.03580       0.25      0.8045
 ------------------------------------------------------------------------------
 X2 alone
                                     Sum of           Mean
 Source                   DF        Squares         Square    F Value    Pr > F
 Model                     1        0.22300        0.22300       0.09    0.7676
 Error                    18       44.57700        2.47650                     
 Corrected Total          19       44.80000                                    
                                                   R-Square     0.0050

                           Parameter       Standard
      Variable     DF       Estimate          Error    t Value    Pr > |t|
      Intercept     1      322.23981        7.20735      44.71      <.0001
      x2            1        0.01083        0.03607       0.30      0.7676
 ------------------------------------------------------------------------------
 X1 & X2 together 
                                     Sum of           Mean
 Source                   DF        Squares         Square    F Value    Pr > F
 Model                     2       34.51681       17.25840      28.53    <.0001
 Error                    17       10.28319        0.60489                     
 Corrected Total          19       44.80000                                    
                                                  R-Square     0.7705
 
                           Parameter       Standard
      Variable     DF       Estimate          Error    t Value    Pr > |t|
      Intercept     1       52.49066       36.00210       1.46      0.1631
      x1            1        0.90376        0.12003       7.53      <.0001
      x2            1        0.91221        0.12103       7.54      <.0001