Data Science and AI: Chapter 3 Quiz
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Questions and Answers

What is the purpose of unstructured/textual data?

  • To be processed by computers
  • To be stored in databases
  • To be processed by humans (correct)
  • To be visualized in graphs

    • Which type of data includes XML, HTML, and log files?

  • Structured data
  • Unstructured/textual data
  • Numeric data
  • Semi-structured data (correct)

    • What is the singular form of the word 'data'?

  • Dataes
  • Datas
  • Data
  • Datum (correct)

    • Which type of data is targeted for computers to process?

    <p>Numeric data</p> Signup and view all the answers

    What is the purpose of structured data?

    <p>To be processed by computers</p> Signup and view all the answers

    Which category of data includes facts and can be either numeric or nominal?

    <p>Structured data</p> Signup and view all the answers

    What is the arithmetic mean of the given data set: {21,23,23,26,26,27,29,30,32}?

    <p>26.33</p> Signup and view all the answers

    What is the measure of dispersion used to calculate how far each number in the set is from the mean?

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

    What does the standard deviation provide a measure of?

    <p>The spread of the numbers in relation to the mean</p> Signup and view all the answers

    Which measure of centrality tendency is considered as the number in the middle of a data set when arranged in ascending order?

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

    What is the measure of dispersion that calculates the difference between the maximum and minimum values in a data set?

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

    Which measure provides a measure of the asymmetry of the probability distribution of a real-valued random variable about its mean?

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

    What does the Mean Absolute Deviation (MAD) calculate?

    <p>Average absolute deviation from the mean</p> Signup and view all the answers

    What type of plot is considered versatile and informative for visualizing quartiles and outliers?

    <p>Box-and-Whiskers Plot</p> Signup and view all the answers

    What type of chart is used to represent the frequency of values in a data set?

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

    What does skewness measure in a probability distribution?

    <p>Asymmetry about its mean</p> Signup and view all the answers

    When calculating variance, what does (xi−x‾)2 represent?

    <p>Sum of squared differences from the mean</p> Signup and view all the answers

    What is used to visualize how data is distributed across quartiles and identify outliers?

    <p>Box-and-Whiskers Plot</p> Signup and view all the answers

    What type of data is targeted for humans to process/digest?

    <p>Unstructured/textual data</p> Signup and view all the answers

    What is the measure of dispersion used to calculate how far each number in the set is from the mean?

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

    What does skewness measure in a probability distribution?

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

    What does the standard deviation provide a measure of?

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

    Which category of data includes facts and can be either numeric or nominal?

    <p>Structured data</p> Signup and view all the answers

    What type of plot is considered versatile and informative for visualizing quartiles and outliers?

    <p>Box plot</p> Signup and view all the answers

    What is the purpose of descriptive statistics?

    <p>To characterize and interpret data as it is</p> Signup and view all the answers

    What does the range measure in a data set?

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

    What does the variance measure in a data set?

    <p>How far each number in the set is from the mean</p> Signup and view all the answers

    What does the standard deviation provide a measure of?

    <p>The spread of the numbers in relation to the mean</p> Signup and view all the answers

    Which measure is considered as the number in the middle of a data set when arranged in ascending order?

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

    What type of chart is considered versatile and informative for visualizing quartiles and outliers?

    <p>Box-and-Whiskers Plot</p> Signup and view all the answers

    What does skewness measure in a probability distribution?

    <p>The asymmetry of the probability distribution about its mean</p> Signup and view all the answers

    What is used to visualize how data is distributed across quartiles and identify outliers?

    <p>Box-and-Whiskers Plot</p> Signup and view all the answers

    What type of chart represents the frequency of values in a data set?

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

    What is another name for the Mean Absolute Deviation (MAD)?

    <p>Absolute Deviation</p> Signup and view all the answers

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