P3/10C

                  SIMPLE LINEAR REGRESSION - PRACTICAL

   It  is  considered  that a linear regression model may be appropriate
for the analysis of the following data, consisting of 11 observations of
a response variable y and an explanatory variable x.  Analyse  the  data
and, in particular, find 95% confidence intervals for

      (a) the slope of the regression line;

      (b) the expected value of y, given x = 10.

Plot the data, and comment on any significant features revealed.


                              x          y

                            10.0       20.70
                             8.0       20.43
                            13.0       25.31
                             9.0       20.56
                            11.0       20.80
                            14.0       21.19
                             6.0       20.21
                             4.0       19.90
                            12.0       20.95
                             7.0       20.31
                             5.0       20.09