5 5. Researchers found that when patients with chronic illnesses were randomly
divided into two groups, the group that got regular coaching by phone from health
professionals to help them manage their illnesses had lower monthly medical costs
than the group that did not get the coaching.

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities