Descriptive Statistics: Numerical Summaries and Plots
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Questions and Answers

What is the totality of all observations of a phenomenon of interest?

  • Sample mean
  • Sample variance
  • Histogram
  • Population (correct)
  • Which visual data display can be used to construct and interpret visual data displays, including the stem-and-leaf display, the histogram, and the box plot?

  • Probability plots
  • Frequency distributions
  • Time sequence plots
  • Stem-and-leaf diagram (correct)
  • What is the concept used to visually compare two or more samples of data?

  • Sample variance
  • Time sequence plots
  • Box plots (correct)
  • Sample standard deviation
  • What is used to explain the concept of random sampling?

    <p>Normal probability plots</p> Signup and view all the answers

    What is used to visually display the important features of time-oriented data?

    <p>Time sequence plots</p> Signup and view all the answers

    Which measure is used to compute and interpret the sample mean, sample variance, sample standard deviation, sample median, and sample range?

    <p>Numerical summaries of data</p> Signup and view all the answers

    What is the measure used to describe the center of a collection of data?

    <p>Mean</p> Signup and view all the answers

    Which parameter is used to measure the spread of a population?

    <p>Standard deviation</p> Signup and view all the answers

    In a random sample, what is used to estimate the parameters of a population?

    <p>Mean</p> Signup and view all the answers

    What is the population mean symbol?

    <p>$μ$</p> Signup and view all the answers

    Which term refers to the balance point in a sample?

    <p>Mean</p> Signup and view all the answers

    What is the formula for calculating the sample variance?

    <p>$s^2 = \frac{1}{n-1} \sum_{i=1}^{n} (x_i - \bar{x})^2$</p> Signup and view all the answers

    What is the symbol for population standard deviation?

    <p>$σ$</p> Signup and view all the answers

    What units are the same as the standard deviation?

    <p>$\mu$</p> Signup and view all the answers

    Which parameter is used to measure the spread of a sample?

    <p>$s$</p> Signup and view all the answers

    What formula is used to calculate the population variance?

    <p>$rac{1}{N} \[ \[ \] \]$ \sum_{i=1}^{N} (x_i - μ)^2 f(x_i)</p> Signup and view all the answers

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