Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uu-Null-hypothesis-807-en_uu-Null-hypothesis-807-en
    nameuu-Null-hypothesis-807-en
    sectionInferential Statistics/NHST/Hypothesis/Null hypothesis
    typeschoice
    solutionFALSE, FALSE, FALSE, TRUE
    TypeConceptual
    Program
    LanguageEnglish
    LevelStatistical literacy

    Question

    A researcher would like to test the effectiveness of a newly developed growth hormone. The researcher knows that under normal circumstances laboratory rats reach an average weight of 950 grams at 10 weeks of age. The distribution of weights is normal with a standard deviation of 30. A random sample of 25 newborn rats is obtained, and the hormone is given to each rat. When the rats in the sample were 10 weeks old, they were weighed. The mean weight for this sample was 974 grams.

    Which null hypothesis should the researcher use?


    1. FALSE: H0: the mean weight of rats that are given the new hormone is larger than 950 grams
    2. FALSE: H0: the mean weight of rats that are given the new hormone is larger than 974 grams
    3. FALSE: H0: the mean weight of rats that are given the new hormone is 974 grams
    4. TRUE: H0: the mean weight of rats that are given the new hormone is 950

    1. This answer is incorrect
    2. This answer is incorrect
    3. This answer is incorrect
    4. This answer is correct