Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_vufgb-variance-002-en_vufgb-variance-002-en
   name	vufgb-variance-002-en
   section	Descriptive statistics/Summary Statistics/Measures of Spread/Variance
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	Calculation, Interpreting output
   Program
   Language	English
   Level	Statistical Thinking

   Question

   See table below. A study examined differences in income among three ethnic groups in the United States (N = 80). The independent variable race had three levels: 1) White, 2) Hispanic and 3) Black. The dependent variable is income (inc), and years of education (educ) is used as a covariate. Given is the following output from a GLM.

   

   Tips:

   • In ANCOVA, the number of degrees of freedom for a covariate equals 1.

   • In an ANCOVA with an interaction between covariate and factor, the number of degrees of freedom for the Error equals n - 2 × g.

   • The degrees of freedom for the interaction are equal to the product of the degrees of freedom of Covariate and Factor.

   • For a true ANCOVA, the number of degrees of freedom for the Error is equal to n - g - 1.

   The variance of the dependent variable inc falls in the interval:

   
   
   1. FALSE: [300, 350]
   2. TRUE: [350, 400]
   3. FALSE: [400, 450]
   4. FALSE: [450, 500]
   
   
   1. Incorrect
   2. Incorrect
   3. Incorrect
   4. Correct