Exam 1

1. Metainformation

   Tag	Value
   file	Distributions_uva-normal-1371-en_uva-normal-1371-en
   name	uva-normal-1371-en
   section	Distributions/Continuous/Normal
   type	schoice
   solution	FALSE, TRUE, FALSE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	-0.739
   p-value	0.9443

   Question

   30,000 telephone calls from the ICT department have a distribution with a mean duration of 173.9 seconds and a standard deviation of 184.8 seconds. You take two random samples of 20 and 80 calls, respectively. Which sample has a smaller variability?

   
   
   1. FALSE: The sample of 20 has smaller variability.
   2. TRUE: The sample of 80 has smaller variability.
   3. FALSE: Both samples have the same variability.
   
   
   1. The sample of 20 has smaller variability…: Incorrect
   2. The sample of 80 has a smaller variability…: Correct
   3. Both samples have the same variability…: Incorrect