Exam 1

1. Metainformation

   Tag	Value
   file	Probability_uva-random-variables-449-en_uva-random-variables-449-en
   name	uva-random-variables-449-en
   section	Probability/Elementary Probability/Random variables
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	2.738
   p-value	0.4332

   Question

   Of 100 individuals, systolic blood pressure (SB) was measured and classified into three classes: 1 = low, 2 = medium and 3 = high. Also, the physical activity behavior (AG) was measured and classified into three classes classified: 1 = rarely, 2 = sometimes, 3 = regularly. The results are shown in cross tabulation below:

   ————- ——– ——– ——– frequencies SB = 1 SB = 2 SB = 3 AG = 1 4 12 14 AG = 2 13 25 12 AG = 3 8 8 4 ————- ——– ——– ——–

   For these 100 people, what is the size of P(SB =3 AG = 3)?

   
   
   1. FALSE: 0.04
   2. FALSE: 0.13
   3. TRUE: 0.2
   4. FALSE: 0.46
   
   
   1. 0.04: Incorrect
   2. 0.13: Incorrect
   3. 0.2: Correct
   4. 0.46: Incorrect