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BUSA6004-online quiz-week 3

Quiz by Hanlin Shang

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5 questions
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  • Q1
    Which of the following statements is INCORRECT?
    To obtain the standard error of the sample mean, we need to know the standard deviation of the sample.
    The standard error of the sample mean is always larger than the standard deviation of a sample
    The standard deviation of a sample measures how spread the observations in the sample are relative to the sample mean.
    The standard error of the sample mean measures how spread the sample means are relative to the population mean. A different sample mean will be obtained when a different sample is drawn from the population.
    90s
  • Q2
    Which of the following statements is INCORRECT?
    A narrow confidence interval means that the population mean cannot be too far from the sample mean
    If a value outside a 95% confidence interval is used as an estimate for the population mean, the chance that we are correct is 95%
    Confidence interval provides an interval that captures the population mean with a given probability
    A 95% confidence interval extends from the sample mean minus the margin of error to the sample mean plus the margin of error.
    90s
  • Q3
    Which of the following statements is INCORRECT?
    Permutation considers the order that objects appear while combination considers the order that objects are selected
    Combination is the number of ways to select a subset of objects from a given set.
    For a given set of objects, permutation is always larger than combination regardless of the size of the subset used to form the combination
    Permutation is the number of ways to arrange objects from a given set.
    90s
  • Q4
    The chance of success of a vaccine development project is 0.05. If the government aims to have two vaccines to be used for Australian people, how many vaccine development projects need to be invested?
    100
    40
    5
    20
    90s
  • Q5
    The chance of success of a vaccine development project is 0.05. Vaccine development companies submit their vaccines to be tested by the government. On average, how many tests need to be conducted before a successful vaccine is found?
    100
    20
    40
    5
    90s

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