Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-standard-deviation-462-en_uva-standard-deviation-462-en
   name	uva-standard-deviation-462-en
   section	Descriptive statistics/Summary Statistics/Measures of Spread/Standard Deviation
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	3.801
   p-value	0.1558

   Question

   Of two independent stochastic variables X and Y is given: var(X) = 9 and var(Y) = 16. Then the standard deviation of X - Y equals to

   
   
   1. FALSE: -7
   2. FALSE: -5
   3. TRUE: 5
   4. FALSE: 25
   
   
   1. 7: Incorrect
   2. 5: Incorrect
   3. 5: Correct
   4. 25: Incorrect