Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_vufsw-expectedvalue-1257-en_vufsw-expectedvalue-1257-en
    namevufsw-expectedvalue-1257-en
    sectionprobability/elementary probability/random variables/expected value
    typeschoice
    solutionFALSE, TRUE, FALSE, FALSE, FALSE
    Typecalculation
    Programcalculator
    LanguageEnglish
    Levelstatistical literacy

    Question

    A researcher is curious how often people play sports during a week and interviews 100 people. He finds the following results.
    What is the expected value of the number of days that people play sports per week on the basis of this sample?

    Playing sport
    (how many days?)
    		 0
    		 1
    		 2
    		 3
    		 4
    		 5
    		 6
    		 7
    P(y)
         		0.70
         		0.10
         		0.08
    		 0.05
         		0.01
         		0.01
    		 0.03 0.02

    ``


    1. FALSE: 1.00
    2. TRUE: 0.82
    3. FALSE: 0.24
    4. FALSE: 0.14
    5. FALSE: 0.70

    Solution

    It is 0,82.

    You can calculate this by: 0*0,7+1*0,1+2*0,08+3*0,05 etc.


    1. False
    2. True
    3. False
    4. False
    5. False