P3/10A

                  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       21.26
                             8.0       20.57
                            13.0       20.15
                             9.0       22.28
                            11.0       21.36
                            14.0       22.30
                             6.0       21.35
                             4.0       18.81
                            12.0       23.63
                             7.0       18.73
                             5.0       20.01