Uni-variate Statistics for Exploratory Data Analysis Quiz
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Questions and Answers

What is used to avoid negative datas from disrupting or cancelling out the deviations in standard deviation calculation?

  • Averaging the deviations
  • Dividing each deviation by the mean
  • Taking the absolute value of each deviation
  • Squaring each deviation (correct)
  • Which statistic represents the most common number in a set of data?

  • Mode (correct)
  • Median
  • Minimum/Maximum
  • Mean
  • What does the 50th percentile represent in a set of data?

  • Quartiles
  • Median (correct)
  • Mean
  • Mode
  • What are the markers used to divide the data into quarters?

    <p>Quartiles, percentiles, median</p> Signup and view all the answers

    Which measure of central tendency is affected by extreme values in the dataset?

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

    What does standard deviation measure in a set of data?

    <p>How spread out the data is around the mean</p> Signup and view all the answers

    What does a correlation coefficient of 0 indicate?

    <p>No correlation</p> Signup and view all the answers

    Which statistical measure is used to show the overall trend and relationship between two variables on a single graph?

    <p>Bi-variate joint plot</p> Signup and view all the answers

    What does a correlation coefficient of +1 indicate?

    <p>Strong positive correlation</p> Signup and view all the answers

    In multivariate statistics, what type of plot is commonly used to compare relationships between multiple variables?

    <p>Pair-plot</p> Signup and view all the answers

    What is the statistical technique used when considering data with strong linear relationships for making predictions?

    <p>Linear regression</p> Signup and view all the answers

    In the context of the text, what does a heatmap in a correlation matrix represent?

    <p>Relationship strength between variables</p> Signup and view all the answers

    What is the objective of training a model?

    <p>To learn the relationship between variables</p> Signup and view all the answers

    Which metric is used to measure how good the final model is compared to the benchmark?

    <p>Explained sum of square (ESS)</p> Signup and view all the answers

    What does Variance measure in a dataset?

    <p>The spread of data points around the mean</p> Signup and view all the answers

    In which type of learning is the prediction of classes involved?

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

    What does Explained Variance (R²) measure about the final model?

    <p>How good the final model is compared to a benchmark</p> Signup and view all the answers

    What does the 25th percentile represent in a set of data?

    <p>The value above which 25% of the data falls</p> Signup and view all the answers

    Why is squaring each deviation important in calculating standard deviation?

    <p>To avoid negative deviations from cancelling each other out</p> Signup and view all the answers

    Which statistical measure characterizes the overall trend and relationship between two variables on a single graph?

    <p>Correlation coefficient</p> Signup and view all the answers

    What is the main purpose of calculating quartiles in a dataset?

    <p>To find markers that divide the data into quarters</p> Signup and view all the answers

    What does the 50th percentile indicate in a set of data?

    <p>It shows the median value of the data</p> Signup and view all the answers

    How is standard deviation calculated in univariate statistics?

    <p>(sum of squared deviations) / (count of data - 1)</p> Signup and view all the answers

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