Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uu-Effect-size-812-en_uu-Effect-size-812-en
    nameuu-Effect-size-812-en
    sectionInferential Statistics/Effect size
    typeschoice
    solutionFALSE, FALSE, FALSE, TRUE
    TypeCase
    LanguageEnglish
    LevelStatistical Literacy

    Question

    Ordinary light bulbs have an average life of 1600 hours with a standard deviation of 100 hours. The average lifetime of 100 randomly selected incandescent bulbs of brand X is 1800 hours. For the light bulbs of brand X, what is the effect size expressed in Cohen’s d?


    1. FALSE: d=0.1d = 0.1.
    2. FALSE: d=0.2d = 0.2.
    3. FALSE: d=1d = 1.
    4. TRUE: d=2d = 2.