2. (8 marks} A sample of 500 customers of a cell service provider agreed to release their age and their average number of text messages sent or received per day to a group of researchers. The researchers are interested in how the average number of texts varies with age. They are considering using a simple linear regression model to describe the data, which are available in the file t ext_age - txt. Assess the reasonableness of each of the four assumptions underlying the model in this context. Provide plots or summary statistics as RECESSBIY