Book Image

Cracking the Data Science Interview

By : Leondra R. Gonzalez, Aaren Stubberfield
Book Image

Cracking the Data Science Interview

By: Leondra R. Gonzalez, Aaren Stubberfield

Overview of this book

The data science job market is saturated with professionals of all backgrounds, including academics, researchers, bootcampers, and Massive Open Online Course (MOOC) graduates. This poses a challenge for companies seeking the best person to fill their roles. At the heart of this selection process is the data science interview, a crucial juncture that determines the best fit for both the candidate and the company. Cracking the Data Science Interview provides expert guidance on approaching the interview process with full preparation and confidence. Starting with an introduction to the modern data science landscape, you’ll find tips on job hunting, resume writing, and creating a top-notch portfolio. You’ll then advance to topics such as Python, SQL databases, Git, and productivity with shell scripting and Bash. Building on this foundation, you'll delve into the fundamentals of statistics, laying the groundwork for pre-modeling concepts, machine learning, deep learning, and generative AI. The book concludes by offering insights into how best to prepare for the intensive data science interview. By the end of this interview guide, you’ll have gained the confidence, business acumen, and technical skills required to distinguish yourself within this competitive landscape and land your next data science job.
Table of Contents (21 chapters)
Free Chapter
1
Part 1: Breaking into the Data Science Field
4
Part 2: Manipulating and Managing Data
10
Part 3: Exploring Artificial Intelligence
16
Part 4: Getting the Job

Understanding the Central Limit Thereom (CLT)

Now that we’ve learned about sampling, now’s the time to introduce one of the most important concepts in classical statistics – the Central Limit Thereom (CLT).

The CLT

Measuring the center of data is not as simple as just calculating the mean, median, or mode. The CLT states that regardless of the original population distribution’s shape, when we repeatedly take samples from that population and each sample is sufficiently large, the distribution of the sample means will approximate a normal distribution. This approximation becomes more accurate as the size of each sample becomes larger. This theorem plays a crucial role in measuring centrality by allowing us to make reliable estimates using these measures. In turn, the CLT enables us to estimate the population mean with greater accuracy, making the mean a powerful tool for summarizing data. It also indirectly influences the estimation of the median and...