An amusement park in a city would like to study whether its number of visitors in Halloween can be used to predict its number of visitors in Christmas. The data (in thousand of visitors) over the past 14 years are shown in the table below: No. in Halloween No. in Christmas 35.0 37.8 28.8 33.6 40.3 41.1 24.0 28.6 31.1 34.9 33.8 38.6 30.6 31.2 33.3 36.9 34.2 35.7 23.6 30.1 38.6 44.6 34.2 36.2 34.7 35.7 22.7 28.3 (a) Find the least-squares regression line from the given data and interpret the slope. Let X be the + and Y be the