Uni-variate Statistics for Exploratory Data Analysis Quiz

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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?

Quartiles, percentiles, median Signup and view all the answers

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

Mean Signup and view all the answers

What does standard deviation measure in a set of data?

How spread out the data is around the mean Signup and view all the answers

What does a correlation coefficient of 0 indicate?

No correlation 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?

Bi-variate joint plot Signup and view all the answers

What does a correlation coefficient of +1 indicate?

Strong positive correlation Signup and view all the answers

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

Pair-plot Signup and view all the answers

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

Linear regression Signup and view all the answers

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

Relationship strength between variables Signup and view all the answers

What is the objective of training a model?

To learn the relationship between variables Signup and view all the answers

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

Explained sum of square (ESS) Signup and view all the answers

What does Variance measure in a dataset?

The spread of data points around the mean Signup and view all the answers

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

Classification Signup and view all the answers

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

How good the final model is compared to a benchmark Signup and view all the answers

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

The value above which 25% of the data falls Signup and view all the answers

Why is squaring each deviation important in calculating standard deviation?

To avoid negative deviations from cancelling each other out Signup and view all the answers

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

Correlation coefficient Signup and view all the answers

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

To find markers that divide the data into quarters Signup and view all the answers

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

It shows the median value of the data Signup and view all the answers

How is standard deviation calculated in univariate statistics?

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