(a) Plot a scatter graph of the data. Does the scatter graph indicate that a linear relationship exists for all or part of the range of the data?
(b) Obtain the regression equation that would enable the price of the car to be obtained given its age.
(c) Using the equation obtained in (b) above and suitable examples, illustrate how the price of a car could be found if its age was known.
Within what price range is your equation valid? Why is this so?
(d) What proportion of the variability in price is explained by the age factor?
(e) Using regression in Excel Tool Pak Add-in or any other statistical software interpret any p-value and explain its use along with the t-test value. What do confidence intervals in the solution tell you?
(f) Using multiple regression investigate whether other factors, such as engine size, would improve the fit of the regression equation.
ตึ้บมากค่ะ พยายามกูเกิ้ลหาหนังสือภาษาไทยที่เกี่ยวข้องแล้วก็งงอยู่ดี ขอบคุณค่ะ
รบกวนช่วยแปลโจทย์และอธิบายหน่อยค่ะว่าโจทย์ต้องการให้ทำอะไร
(b) Obtain the regression equation that would enable the price of the car to be obtained given its age.
(c) Using the equation obtained in (b) above and suitable examples, illustrate how the price of a car could be found if its age was known.
Within what price range is your equation valid? Why is this so?
(d) What proportion of the variability in price is explained by the age factor?
(e) Using regression in Excel Tool Pak Add-in or any other statistical software interpret any p-value and explain its use along with the t-test value. What do confidence intervals in the solution tell you?
(f) Using multiple regression investigate whether other factors, such as engine size, would improve the fit of the regression equation.
ตึ้บมากค่ะ พยายามกูเกิ้ลหาหนังสือภาษาไทยที่เกี่ยวข้องแล้วก็งงอยู่ดี ขอบคุณค่ะ