Data Science Interview Challenge

Data Science Interview Challenge

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1. Python

Let's take a look at what we'll be working with in this course. The first section will acquaint you with Python, a flexible and advanced programming language known for its clear syntax and readability.

Challenge 1: List Comprehension

Challenge 2: String Manipulation

Challenge 3: Dictionary Manipulation

Challenge 4: Nested Loops

Challenge 5: Classes

Theoretical Questions

2. NumPy

NumPy is a fundamental library in Python that facilitates efficient numerical computations with powerful n-dimensional arrays and mathematical functions.

Challenge 1: Array Creation

Challenge 2: Array Manipulation

Challenge 3: Statistical Insights

Challenge 4: Handling Missing Values

Challenge 5: Subarray Sorting

Theoretical Questions

3. Pandas

Pandas provides intuitive and versatile data structures for efficient data manipulation and analysis, streamlining the initial stages of the data science pipeline.

Challenge 1: DataFrame Creation

Challenge 2: Data Grouping

Challenge 3: Indexing and MultiIndexing

Challenge 4: Altering DataFrame

Challenge 5: Iterating Over Data

Theoretical Questions

4. Matplotlib

Matplotlib is a comprehensive Python library for creating static, animated, and interactive visualizations in Python.

Challenge 1: Fundamentals of Plotting

Challenge 2: Other Graph Types

Challenge 3: Subplots

Challenge 4: Customizing Plots

Challenge 5: Adding Text to Plots

Theoretical Questions

5. Seaborn

Seaborn is a Python data visualization library based on Matplotlib that provides a high-level interface for creating informative and attractive statistical graphics.

Challenge 1: Visualizing Distributions

Challenge 2: Exploring Categorical Data

Challenge 3: Relational Plots

Challenge 4: Regression Plots

Challenge 5: Matrix Plots

Theoretical Questions

6. Statistics

Statistics provides data scientists with foundational techniques and tools to extract meaningful insights from data, allowing them to make informed decisions and predictions based on empirical evidence.

Challenge 1: Probabilities and Distributions

Challenge 2: Bayes' Theorem

Challenge 3: Hypothesis Testing

Challenge 4: Confidence Intervals

Challenge 5: Correlation

Theoretical Questions

7. Scikit-learn

Scikit-learn is an open-source Python library that provides simple and efficient tools for data analysis and modeling, particularly for machine learning. Data scientists use it extensively for its comprehensive collection of algorithms and processing techniques, enabling them to quickly develop and deploy predictive models.

Challenge 1: Data Scaling

Challenge 2: Basic Model Creation

Challenge 3: Pipelines

Challenge 4: Cross-validation

Challenge 5: Hyperparameter Tuning

Theoretical Questions

Зміст курсу

Data Science Interview Challenge

Data Science Interview Challenge

1. Python

Introduction Challenge 1: List Comprehension Challenge 2: String Manipulation Challenge 3: Dictionary Manipulation Challenge 4: Nested Loops Challenge 5: Classes Theoretical Questions

2. NumPy

Challenge 1: Array Creation Challenge 2: Array Manipulation Challenge 3: Statistical Insights Challenge 4: Handling Missing Values Challenge 5: Subarray Sorting Theoretical Questions

3. Pandas

Challenge 1: DataFrame Creation Challenge 2: Data Grouping Challenge 3: Indexing and MultiIndexing Challenge 4: Altering DataFrame Challenge 5: Iterating Over Data Theoretical Questions

4. Matplotlib

Challenge 1: Fundamentals of Plotting Challenge 2: Other Graph Types Challenge 3: Subplots Challenge 4: Customizing Plots Challenge 5: Adding Text to Plots Theoretical Questions

5. Seaborn

Challenge 1: Visualizing Distributions Challenge 2: Exploring Categorical Data Challenge 3: Relational Plots Challenge 4: Regression Plots Challenge 5: Matrix Plots Theoretical Questions

6. Statistics

Challenge 1: Probabilities and Distributions Challenge 2: Bayes' Theorem Challenge 3: Hypothesis Testing Challenge 4: Confidence Intervals Challenge 5: Correlation Theoretical Questions

7. Scikit-learn

Challenge 1: Data Scaling Challenge 2: Basic Model Creation Challenge 3: Pipelines Challenge 4: Cross-validation Challenge 5: Hyperparameter Tuning Theoretical Questions

Theoretical Questions

1. How do you handle overfitting in a model?

2. Explain bias-variance trade-off.

3. What is early stopping in the context of training a model?

4. How would you handle imbalanced datasets?

5. Which of the following best describes the difference between data normalization and scaling?

6. How does cross-validation work?

7. Which statement best describes the difference between precision and recall?

8. Which kind of models are utilized by the bagging ensemble method?

9. How does a Random Forest algorithm function?

10. Which of the following is not an ensemble method?

11. In which scenario is a high recall more important than high precision?

How do you handle overfitting in a model?

Виберіть кілька правильних відповідей

Increasing the amount of training data.

By using data augmentation.

By using highly complex models.

By using a regularization technique.

Explain bias-variance trade-off.

Виберіть правильну відповідь

It's about choosing the optimal number of clusters in KMeans.

It's the balance between a model's flexibility and its ability to generalize to unseen data.

It's the trade-off between L1 and L2 regularization.

It's the decision between early stopping and training for more epochs.

What is early stopping in the context of training a model?

Виберіть правильну відповідь

It's a regularization technique involving the magnitude of coefficients.

It's a method to prevent overfitting by terminating training once a certain condition is met, often when the validation loss starts increasing.

It's a technique to balance datasets.

How would you handle imbalanced datasets?

Виберіть кілька правильних відповідей

By using L1 or L2 regularization techniques.

With early stopping during training.

By using methods like oversampling, undersampling, or synthetic data generation.

By adding weights to classes.

Which of the following best describes the difference between data normalization and scaling?

Виберіть правильну відповідь

Normalization is about making data follow a Gaussian distribution while scaling adjusts the range of the data.

Scaling involves converting data to a range between 0 and 1, while normalization makes data zero-centered.

Both normalization and scaling adjust the range of data to between 0 and 1.

How does cross-validation work?

Виберіть правильну відповідь

It trains the model on the entire dataset and then tests on the same dataset.

It divides the dataset into 'k' equal partitions and uses each partition as a test set while the remaining parts as a training set, iterating 'k' times.

It trains the model once on a random subset and tests on the remaining data.

It tests the model 'k' times on the same validation set after training on the whole dataset.

Which statement best describes the difference between precision and recall?

Виберіть правильну відповідь

Precision is the number of true positives divided by the number of true positives plus false negatives, while recall is the number of true positives divided by the number of true positives plus false positives.

Precision measures the number of correct predictions, while recall measures the number of false predictions.

Precision focuses on the accuracy of the positive predictions, while recall focuses on capturing as many positives as possible.

Which kind of models are utilized by the bagging ensemble method?

Виберіть правильну відповідь

Different types of models for each ensemble.

Same type models for each ensemble.

Exclusively for Decision Trees.

Exclusively for shallow Neural Networks.

How does a Random Forest algorithm function?

Виберіть правильну відповідь

It builds multiple decision trees and averages their results.

It constructs a single decision tree with random feature selection.

It uses randomness to choose the depth of a single decision tree.

Which of the following is not an ensemble method?

Виберіть правильну відповідь

Boosting

Bagging

Stacking

Scaling

In which scenario is a high recall more important than high precision?

Виберіть правильну відповідь

Recommending products to online shoppers.

Filtering out spam emails.

Diagnosing a rare, deadly disease.

Identifying suitable advertisements for users based on their browsing history.

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