Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-variance-394-en_uva-variance-394-en
   name	uva-variance-394-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	3.935
   p-value	0.1356

   Question

   X₁, X₂ and X₃ are independent draws from a distribution with expectation 30 and standard deviation 2. Then the variance of X₁ + X₂ + X₃ equals

   
   
   1. FALSE: 6
   2. TRUE: 12
   3. FALSE: 18
   4. FALSE: 24
   
   
   1. 6: Incorrect
   2. 12: Correct
   3. 18: Incorrect
   4. 24: Incorrect