Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-confidence-level-786-en_uva-confidence-level-786-en
    nameuva-confidence-level-786-en
    sectionInferential Statistics/Confidence Intervals/Confidence level
    typeschoice
    solutionFALSE, TRUE, FALSE
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty4.18
    p-value0.0877

    Question

    A study is looking at whether the new drug Koburol reduces symptoms reduces symptoms in people with psychosis. First, the drug is being tested on a small scale testing. If the results are positive, it will be tested on a larger group of individuals. The researcher will measure the presence of symptoms by having participants complete a questionnaire. Two months after the participants have started, the researcher will take the questionnaire again with the same subjects. The scores are shown in table below.

    ———– —— —- Participant Before After 1 85 81 2 75 70 3 80 74 ———– —— —-

    The average of the difference scores (before – after) is xd\bar{x}_{d} = 5 and the standard deviation of the difference scores Sd = 0.82. Calculate the 95% confidence interval for the difference between the population averages of the participants before and after using Koburol._____________________.  The 95% confidence interval for the difference between the population averages is


    1. FALSE: 1.47, 8.53
    2. TRUE: 2.98, 7.02
    3. FALSE: 4.08, 5.92

    1. 1.47, 8.53: Incorrect
    2. 2.98, 7.02: Correct
    3. 4.08, 5.92: Incorrect