Alumni Contributions Numbers for the amount of an alumnus's contribution (in dollars) and the years the alumnus has been out of school are shown. The regression line equation is y' = 401.506-23.922x. The standard error of the estimate is S100.93. Find the 90% interval when x = 13 years. Round your answers to two decimal places as needed. est Year x 2 6 5 10 3 12 400 350 150 300 50元 Contribution y 250 Send data to Excel The 90% rediction interval is |