Exam 1

1. Metainformation

   Tag	Value
   file	Probability_uva-sample-space-732-en_uva-sample-space-732-en
   name	uva-sample-space-732-en
   section	Probability/Elementary Probability/Sample Space
   type	schoice
   solution	FALSE, FALSE, FALSE, TRUE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	-2.737
   p-value	0.9716

   Question

   You work in a department of 21 people. In a box there are 21 envelopes. Twenty of them contain a 100 euro book voucher. The twenty-first envelope is empty. The twenty-one people go into a line. The first person in line receives a randomly selected envelope. For the second person, from the remaining envelopes one is randomly chosen, et cetera. Of course, you want to have the smallest possible chance of receiving the empty envelope.

   
   
   1. FALSE: It’s best to get to the front of the line then.
   2. FALSE: It is best to go to the back of the queue.
   3. FALSE: It is best to stand in the middle of the queue (i.e. eleventh place).
   4. TRUE: It makes no difference at all which place you stand.
   
   
   1. You’d best get to the front of the line then…: Incorrect
   2. It’s best to go to the back of the line then…: Incorrect
   3. It is best to stand in the middle of the queue (i.e. eleventh place): Incorrect
   4. It doesn’t matter at all which place you stand…: Correct