Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-standard-deviation-523-en_uva-standard-deviation-523-en
   name	uva-standard-deviation-523-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	4.079
   p-value	0.098

   Question

   Given two independent stochastic variables x and y with standard deviation 12 and 5, respectively. z = x - y. The s.d. of z is then

   
   
   1. FALSE: 7
   2. FALSE: 10.9
   3. TRUE: 13
   4. FALSE: 17
   
   
   1. 7: Incorrect
   2. 10.9: Incorrect
   3. 13: Correct
   4. 17: Incorrect