Exam 1

1. Metainformation

   Tag	Value
   file	Probability_uva-independent-events-369-en_uva-independent-events-369-en
   name	uva-independent-events-369-en
   section	Probability/Elementary Probability/General Rules/Independent events
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	3
   p-value	0.311

   Question

   In a randomly drawn sample of 200 independent individuals, we looked at the occurrence of RSI complaints (none, mild, severe) and the type of work (much computer work, other).

   ———– —————- ————– ——- ——— yes RSI complaints None Mild Serious Type of work Much computer 18 14 8 Other 120 32 8 ———– —————- ————– ——- ———

   Define A as the event “No RSI symptoms” and B as the event “Lots of computer work.” Then

   
   
   1. FALSE: A and B are dependent because P(A ∩ B) ≠ P(B | A)
   2. FALSE: A and B are dependent because P(A) ≠ P(B | A)
   3. TRUE: A and B are dependent because P(A) ≠ P(A | B)
   4. FALSE: A and B are dependent because P(A∪B) ≠ P(A) x P(B)
   
   
   1. A and B are dependent because P(A ∩ B) ≠ P(B | A): Incorrect
   2. A and B are dependent because P(A) ≠ P(B | A): Incorrect
   3. A and B are dependent because P(A) ≠ P(A | B): Correct
   4. A and B are dependent because P(A∪B) ≠ P(A) x P(B): Incorrect