6. A research team is studying cognitive decline in old age.They collect data on 300 people between the ages of 75 and 95 years.One of the key variables is a measure of one particular aspect of cognitive functioning: Executive function (named EXFUNC in the dataset).For this study it is measured using a test that produces values ranging from 0 to 100, with higher values representing better executive function.The investigators fit a linear regression model to their data and obtain the following estimated model:

EXFUNC_i = 161.73 - 1.05AGE_i + e_i

According to this model, by how many points does the typical score on the executive function scale decline between age 80 and 90?