Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-confidence-level-885-en_uva-confidence-level-885-en
    nameuva-confidence-level-885-en
    sectionInferential Statistics/Confidence Intervals/Confidence level
    typeschoice
    solutionFALSE, FALSE, TRUE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.562
    p-value0.1919

    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 30 minutes and standard deviation 5; the mean of group (2) was 60 minutes and standard deviation 6. The researchers assume that the standard deviations in the population are are equal and thus arrive at a standard error of 2.017 and 28 degrees of freedom. A 95% confidence interval for the difference 1 - 2 is


    1. FALSE: (-30.13, -29.87).
    2. FALSE: (-32.13, -27.87).
    3. TRUE: (-34.13, -25.87).

    1. (-30.13, -29.87).: Incorrect
    2. (-32.13, -27.87).: Incorrect
    3. (-34.13, -25.87).: Correct