Question 3 - Answer

3a) We are interested in the columns 'WEIGHT' and 'HEIGHT'. The aim is to predict one from the other. The appropriate data model is correlation-regression data.

b) We summarize the data by a scatterplot and the regression line:

          -
      77.0+
          -                                     *   *   *
  HEIGHT  -                               * 2           *       *
          -                                       *   *
          -                   *     2**   * 4 *2*     2       *
      70.0+                   * 2 * 3*      * * 2
          -               * **4 3 2 3   * 2 * *
          -               ** *    2  **         *
          -               2 2*  2*  3   *
          -     *       2*4 3 4 2
      63.0+        2  *   * *       *
          -           *
          -
          -
          -                         *
      56.0+
            ------+---------+---------+---------+---------+---------+WEIGHT  
                100       125       150       175       200       225
 
 
 The regression equation is
 WEIGHT = - 207 + 5.16 HEIGHT

So, for a student of height 6.1 ft = 73.2 in, we would expect a weight of -207 + 5.16*73.2 = 170.7 lb.