Percentiles and Standard Deviation Quiz
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Questions and Answers

What is the purpose of scales, grid lines, dots, and legends used in graphical data presentations?

  • To distort the proportions
  • To indicate the data being represented (correct)
  • To confuse the viewers
  • To hide the actual data
  • In a standard normal distribution, where do approximately 68% of the data lie?

  • Within one standard deviation from the mean (correct)
  • Exactly on the mean
  • Outside two standard deviations from the mean
  • Within two standard deviations from the mean
  • What does a Venn diagram represent using circular regions?

  • The number of grid lines
  • Only one set of objects
  • Different colors
  • Various sets of objects (correct)
  • What term describes the range of the middle 50% of a dataset, showing how spread out the values are?

    <p>Interquartile range</p> Signup and view all the answers

    If a scale on a line graph does not begin at zero, what might this practice lead to?

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

    How are areas of individual sectors represented in a circle graph according to standard conventions?

    <p>Proportional to the percents they represent</p> Signup and view all the answers

    What does the 25th percentile represent in terms of quartiles?

    <p>First quartile</p> Signup and view all the answers

    What is the median for a list of data with an even number of elements?

    <p>The mean of the two middle numbers</p> Signup and view all the answers

    Which statistic measures the spread of data about the mean?

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

    How are quartiles defined for data listed in increasing order?

    <p>They divide the data into four groups with roughly equal size</p> Signup and view all the answers

    What does the mode represent in a set of data?

    <p>The most frequently occurring number</p> Signup and view all the answers

    What is the standard deviation of a set of data related to?

    <p>Mean and each data point</p> Signup and view all the answers

    How is the interquartile range (IQR) calculated?

    <p>Second quartile minus first quartile</p> Signup and view all the answers

    How many numbers divide the data into 100 groups for percentiles?

    <p>99</p> Signup and view all the answers

    If the 50th percentile is also known as the median, what does the 75th percentile represent?

    <p>Third quartile</p> Signup and view all the answers

    In a set of data, what does the interquartile range represent?

    <p>The range of the second and third quartiles</p> Signup and view all the answers

    What does the range of a set of data measure?

    <p>Difference between maximum and minimum values</p> Signup and view all the answers

    What is calculated by subtracting the first quartile from the third quartile?

    <p>Interquartile range</p> Signup and view all the answers

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