4) A 1974 study about endangered species includes the following. If x = number of years after 1950, and y = number of whooping crane sightings in the Arkansas National Wildlife Refuge, then
y^ = 15.36 + 1.82x , R2 = .93

a) What is the expected number of sightings in 1960? [2 pts]

b) What is the residual for the year 1960? [2 pts]

c) By how much is the number of sightings predicted to increase each year? [2 pts]

d) What is the correlation? [1 pt]

e) Interpretation: % of the variability in is accounted for by . [3 pts]