Probability distributions, expectation and variance

  • Binomial conditions
    problem

    Binomial Conditions

    Age
    16 to 18
    Challenge level

    When is an experiment described by the binomial distribution? Why do we need both the condition about independence and the one about constant probability?

  • A well-stirred sample
    problem

    A Well-Stirred Sample

    Age
    16 to 18
    Challenge level

    Typical survey sample sizes are about 1000 people. Why is this?

  • Exponential intersection
    problem

    Exponential Intersection

    Age
    16 to 18
    Challenge level

    Can the pdfs and cdfs of an exponential distribution intersect?

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