Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_vufgb-equation-026-en_vufgb-equation-026-en
   name	vufgb-equation-026-en
   section	Inferential Statistics/Regression/Equation
   type	schoice
   solution	TRUE, FALSE, FALSE, FALSE
   Type	Calculation
   Program
   Language	English
   Level	Statistical Thinking

   Question

   A researcher fits a linear regression model incorporating a quadratic effect, and finds $\hat{y} = 8.67+3.44x-2.93x^{2}$.

   At what x value is the maximum?

   
   
   1. TRUE: $x = 0.59$
   2. FALSE: $x = -0.59$
   3. FALSE: $x = 1.17$
   4. FALSE: $x = -1.17$
   
   

   Solution

   Use formula $x = \frac{-b_{1}}{2b_{2}} = \frac{-3.44}{2 \times -2.93} = 0.59$.

   
   
   1. Correct
   2. Incorrect
   3. Incorrect
   4. Incorrect