Percent return x 74 66 81 52 73 62 52 45 62 46 60 46 38 New adults y 5 6 8 11 12 15 16 17 18 18 19 20 20 You saw in Exercise 4.29 that there is a moderately strong linear relationship, with correlation r = -0.748. (a) Find the least-squares regression line for predicting y from x. Make a scatterplot and draw your line on the plot. (b) Explain in words what the slope of the regression line tells us. (c) An ecologist uses the line, based on 13 colonies, 5. to predict how many new birds will join another colony, to which 60% of the adults from the previ- ous year return. What is the prediction?bence to be quite accurate. Why. 3.39 Sparrowhawk colonies. One of nature's patterns con- nects the percent of adult birds in a colony that return from the previous year and the number of new adults that join the colony. Here are data for 13 colonies of spar- rowhawks:20 SPARROW