Exam 1

1. Metainformation

   Tag	Value
   file	Distributions_uva-normal-1370-en_uva-normal-1370-en
   name	uva-normal-1370-en
   section	Distributions/Continuous/Normal
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	2.875
   p-value	0.4167

   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 a random sample of 80 calls. What then is the theoretical standard deviation?

   
   
   1. FALSE: 2.3 seconds
   2. TRUE: 20.7 seconds
   3. FALSE: 40 seconds
   4. FALSE: 184.8 seconds
   
   
   1. 2.3 seconds: Incorrect
   2. 20.7 seconds: Correct
   3. 40 seconds: Incorrect
   4. 184.8 seconds: Incorrect