144 The designers of a database information system that allows its users to arch backward for several days wanted to develop a formula to pre- ct the time it would take to search. Actual elapsed time was mea sured for several different values of days. The measured data is shown in Table 14.4. Prepare a simple regression model for this data to predict elapsed time as a function of the number of days and interpret results TABLE 144 Measured Performance of a Database Information System Number of Days Elapsed Time 0.65 0.79 1.36 2.26 3.59 5.39 16 25