In order for an international banking corporations employees to work in a foreign office, they must take a test in the language of the country where they plan to work. The data below shows the relationship between the number of years that employees have studdied a particular language and the grades they have received on the proficiency exam. Number of years x- 3,3,5,5,4,6,3,7,4 Grades on test y - 59,66,75,82,73,89,55,91,80.
a) Find the equation of the regression line for the given data
b) what would be the best predicted score for a student who has studied a language for 1 years? Round the regression line values to the nearest hundredth and round the predicted score.
C) The decision to use y hat or the mean of y was based upon what computed value? (critical value)
D) is this prediction reasonable given this data set? Why or why not?