Without explanation

7. The following regression model has been computed based on a sample of twenty observations: Y^ = 34.2 +19.3 X. Given this model, the predicted value for y when x = 140 is 806.2. True [ ] False ] 8. If two variables are related in a positive linear manner, the scatter plot will show points on the x.y space that are generally moving from the lower right to the True [ ] False ] upper left. 9. When a pair of variables has a positive correlation, the slope in the regression equation will always be negative. True ] False [ ] 10. The higher the level of confidence, the narrow the confidence interval must be. True [ ] False { ]