Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-confidence-level-882-en_uva-confidence-level-882-en
    nameuva-confidence-level-882-en
    sectionInferential Statistics/Confidence Intervals/Confidence level
    typeschoice
    solutionFALSE, TRUE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.725
    p-value0.1676

    Question

    In a study of the length of time it takes to make a decision about purchasing a home based on photo opportunities, researchers assigned 30 people randomly assigned to one of two conditions: (1) 20 photos of the house were shown and (2) 5 photos of the house were shown. The mean of group (1) was 2.0 hours and standard deviation 2.1; the mean of group (2) was 4.8 hours and standard deviation 3.2. The researchers assume that the standard deviations in the population are are equal and thus arrive at a standard error of 0.9883 and 28 degrees of freedom. A 95% confidence interval for the difference 1 - 2 is


    1. FALSE: (-4.72, -0.88).
    2. TRUE: (-4.82, -0.78).
    3. FALSE: (-4.92, -0.68).

    1. (-4.72, -0.88).: Incorrect
    2. (-4.82, -0.78).: Correct
    3. (-4.92, -0.68).: Incorrect