In a double smoothing model, the second smoothing constant is introduced to account for the trend in ...

In a double smoothing model, the second smoothing constant is introduced to account for the trend in the data if one exists.
 
  Indicate whether the statement is true or false

Q. 2

Which of the following is not an assumption of the multiple regression model?
 
  A) The mean of the residuals is equal to the variance at all combinations of levels of the independent variables.
  B) The regression error terms are normally distributed.
  C) The model error terms are independent.
  D) The residuals have a constant variance for all combinations of values for the independent variables.

Q. 3

A p-chart would potentially be used to monitor the diameters of bolts made by a bolt manufacturing plant.
 
  Indicate whether the statement is true or false

Q. 4

To check out whether the regression assumption involving normality of the error terms is valid, it is appropriate to construct a normal probability plot.
 
  If this plot forms a straight line from the lower left-hand corner diagonally up to the upper right-hand corner, the error terms may be assumed to be normally distributed. Indicate whether the statement is true or false