Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-variance-276-en_uva-variance-276-en
   name	uva-variance-276-en
   section	Descriptive statistics/Summary Statistics/Measures of Spread/Variance
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	4.447
   p-value	0.0253

   Question

   X₁, and X₂ are independent draws from a distribution with μ = 10 and σ² = 9. The variance of (X₁ + X₂) / 2 is then equal to

   
   
   1. FALSE: 2.25
   2. TRUE: 4.5
   3. FALSE: 6.36
   4. FALSE: 9
   
   
   1. 2.25: Incorrect
   2. 4.5: Correct
   3. 6.36: Incorrect
   4. 9: Incorrect