i need it in 20 mnt The way to test if significant autocorrelations are present in time series regression models is by using the __________.
If it is suspected that there could be some interaction between two independentx1andx2, which of the following steps would be appropriate to explore the effect of interaction between the two variables on the dependent variable in a multiple regression model? | To test if an individualicoefficient in the population multiple regression model is significantly different from zero, a hypothesis test is conducted on the correspondingbicoefficient in the regression equation developed using sample data. This test is a __________. If a quadratic model of the regression relationship betweeny(a dependent variable) andx(an independent variable) will contain __________. | | a first-order and a second-order term |
| | a first-order and a fourth-order term |
| Add a logx2variable to the regression model |
| | Add anx22variable to the regression model |
| | Add anx12x22variable to the regression model |
| | Add a logx1variable to the regression model |
| | Add anx1x2variable to the regression model |
Exponential smoothing is a forecasting technique in which the forecast for the next period is __________. | | equal to the actual value for the current period |
| | a combination of the actual value for the current period plus an adjustment based on the error of the forecast for the current time period |
| | equal to the forecast for the current time period |
| | a combination of the actual value for the current period and the forecast for the current time period |
| Durbin-Watson test |
| | Spearmans rank correlation coefficient |
In a data set, which contains the data values collected over time, the data values in any given time period are usually __________.
| | unrelated to the values from past time periods |
| | correlated with the values from past time periods |
| | independent of the values from past time periods |
| | equal to the values from past time periods |
| | Spearmans rank correlation coefficient |
For a certain item the actual demand for the current month that ended just now is 100 units while the forecast for the current month was 90 units. The forecast for the next month using an exponential smoothing technique with= 0.2 is __________.
