Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-confidence-level-883-en_uva-confidence-level-883-en
    nameuva-confidence-level-883-en
    sectionInferential Statistics/Confidence Intervals/Confidence level
    typeschoice
    solutionTRUE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty4.239
    p-value0.0774

    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 120 minutes and standard deviation 20; the mean of group (2) was 250 minutes and standard deviation 25. The researchers assume that the standard deviations in the population are are equal and thus arrive at a standard error of 8,266 and 28 degrees of freedom. A 95% confidence interval for the difference 1 - 2 is


    1. TRUE: (-146.93, -113.07).
    2. FALSE: (-156.93, -103.07).
    3. FALSE: (-166.93, -93.07).

    1. (-146.93, -113.07).: Correct
    2. (-156.93, -103.07).: Incorrect
    3. (-166.93, -93.07).: Incorrect