For the data in the microcomputer data file to do the autocorrelation test with the Durbin-Watson and Ljung-Box criteria at a level of importance of 5%, using the program R. In the first column is the variable Y and in the second the X. Then correct the problem of self-correlation with the method of the first differences and do the above checks again to make sure that the problem of self-correlation has been eliminated.

 Data from the microcomputer data file: 102.9 2.052 101.5 2.026 100.8 2.002 98.0 1.949 97.3 1.942 93.5 1.887 97.5 1.986 102.2 2.053 105.0 2.102 107.2 2.113 105.1 2.058 103.9 2.060 103.0 2.035 104.8 2.080 105.0 2.102 107.2 2.150