20 a. Use a graphing calculator to find the equation of the line of best fit. Round the slope to the nearest tenth and the y - intercept to the nearest integer. y = 4.9x - 38
20 b. Identify the correlation coefficient. Round to the nearest thousandth.
r = 0.936
Interpret the correlation coefficient.
The data show a strong positive correlation.
20 c. Interpret the slope and the y - intercept of the line of best fit.
The slope, m, means, the cost of the sailboat increases by m thousands of dollars for each foot the length of the sailboat increases. The y - intercept, b, indicates the initial cost of the sailboat.
20 d. Use the model from part (a) to approximate the cost of a sailboat that is 20 feet long. The sailboat costs $?
20 e. Use the model from part (a) to predict the length of a sailboat that costs $147,000. Round to the nearest foot. The length is about feet.