(b) This question investigates the relationship between the time taken to upload a file to the eTMA system and the number of students using the eTMA system at a particular time. A sample of 20 students were asked to record the time at which their eTMA submission was received and the time taken to upload their eTMA file. The researcher then checked to see how many students were logged on to the eTMA system at the recorded submission times. The results were displayed on a scatterplot with the regression line included. The number of students logged on at the submission time was displayed on the horizontal axis, and the time taken to upload the file (in seconds) was displayed on the vertical axis. The number of students logged on to the system at the times recorded ranged from approximately 1500 to 4500. (ii) The correlation coefficient r for the investigation is 0.97. What does this tell you about the relationship between a and y? [2]