In calculating the regression equation linking two variables, the standard formulae for the regression coefficients are given in terms of X and Y. Which of the following is true?
A、X must be the variable which will be forecast
B、It does not matter which variable is which
C、Y must be the dependent variable
D、Y must be the variable shown on the vertical
A、X must be the variable which will be forecast
B、It does not matter which variable is which
C、Y must be the dependent variable
D、Y must be the variable shown on the vertical
【参考答案及解析】
The independent variable is denoted by X and the dependent one by Y.With such a small sample and the extrapolation required, the estimate is unlikely to be reliable. (iii) is therefore not true.The sample of only six pairs of values is very small and is therefore likely to reduce the reliability of the estimate. (iv) is therefore true.The correct answer is therefore D.
The independent variable is denoted by X and the dependent one by Y.With such a small sample and the extrapolation required, the estimate is unlikely to be reliable. (iii) is therefore not true.The sample of only six pairs of values is very small and is therefore likely to reduce the reliability of the estimate. (iv) is therefore true.The correct answer is therefore D.