MS-DS Master of Data science MS-DS Master of Data science Exploratory Data Analysis Questions and Answers 2 — Questions and Answers
Question 1: Which visualization is most appropriate for examining the relationship between two continuous variables in exploratory data analysis?
- Scatter plot (Correct answer)
- Bar chart
- Pie chart
- Treemap
Correct answer: Scatter plot
Scatter plots display individual data points along two continuous axes, making correlations and clusters visible.
Question 2: What does a right-skewed distribution indicate about the data?
- The tail extends toward higher values (Correct answer)
- The tail extends toward lower values
- The data is perfectly symmetric
- The data has no outliers
Correct answer: The tail extends toward higher values
Right-skewed (positively skewed) distributions have a longer tail on the right side, meaning most values cluster at lower ranges with some extreme high values.
Question 3: In EDA, what is the primary purpose of computing the interquartile range (IQR)?
- To measure the spread of the middle 50% of data (Correct answer)
- To calculate the mean of the dataset
- To determine the mode of the distribution
- To normalize the data for modeling
Correct answer: To measure the spread of the middle 50% of data
The IQR captures the range between the 25th and 75th percentiles, representing the central spread of the data.
Question 4: Which technique helps identify multicollinearity among features during exploratory analysis?
- Correlation heatmap (Correct answer)
- Histogram
- QQ plot
- Run chart
Correct answer: Correlation heatmap
A correlation heatmap visualizes pairwise correlations between all features, making it easy to spot highly correlated variable pairs.
Question 5: What does a bimodal distribution suggest about the underlying data?
- The data likely contains two distinct subgroups (Correct answer)
- The data follows a normal distribution
- All values are equally probable
- The dataset has too many missing values
Correct answer: The data likely contains two distinct subgroups
A bimodal distribution with two peaks typically indicates the presence of two overlapping subpopulations within the dataset.
Question 6: When performing EDA on a dataset with 50 features, which method efficiently reduces dimensionality for visualization?
- Principal Component Analysis (PCA) (Correct answer)
- Simple linear regression
- Chi-square test
- ANOVA
Correct answer: Principal Component Analysis (PCA)
PCA projects high-dimensional data onto fewer principal components while preserving maximum variance, enabling 2D or 3D visualization.
MS-DS Master of Data science MS-DS Master of Data science Exploratory Data Analysis Questions and Answers 2
Which visualization is most appropriate for examining the relationship between two continuous variables in exploratory data analysis?