Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-variance-316-en_uva-variance-316-en
   name	uva-variance-316-en
   section	Descriptive statistics/Summary Statistics/Measures of Spread/Variance
   type	schoice
   solution	TRUE, FALSE, FALSE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	4.542
   p-value	0.016

   Question

   4. X₁, X₂, X₃ and X₄ are independent draws from a distribution with μ = 3 and σ² = 0.25. The variance of (X₁ + X₂ + X₃ + X₄) / 4 is then equal to

   
   
   1. TRUE: 0.0625
   2. FALSE: 0.125
   3. FALSE: 0.25
   4. FALSE: 1
   
   
   1. 0.0625: Correct
   2. 0.125: Incorrect
   3. 0.25: Incorrect
   4. 1: Incorrect