问题：
A company's management accountant is analysing the reject rates achieved by 100 factory operatives working in identical conditions. Reject rates, Y%, are found to be related to months of experience, X, by this regression equation： Y = 20 - 0.25X. (The correlation coefficient was r = -0.9.) Using the equation, what is the predicted reject rate for an operative with 12 months' experience?
A company's management accountant is analysing the reject rates achieved by 100 factory operatives working in identical conditions. Reject rates, Y%, are found to be related to months of experience, X, by this regression equation： Y = 20 - 0.25X. (The correlation coefficient was r = -0.9.) Using the equation, what is the predicted reject rate for an operative with 12 months' experience?
参考答案：