每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 360

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DS Interview Question

Why we need to do A/B Testing?

BA Interview Question

What is the best way to use Hadoop and R together for analysis?

LeetCode Question

Add Two Linked Lists

Description:

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

You may assume the two numbers do not contain any leading zero, except the number 0 itself.

DS Interview Question & Answer

How A/B Testing works.

Answer:

In an A/B test, you take a webpage or app screen and modify it to create a second version of the same page. Then, half of your traffic is shown the original version of the page (known as the control) and half are shown the modified version of the page (the variation).

As visitors are served either the control or variation, their engagement with each experience is measured and collected in an analytics dashboard and analyzed through a statistical engine. You can then determine whether changing the experience had a positive, negative, or no effect on visitor behavior.

BA Interview Question & Answer

R programming: what is the differences between the values of “coef()” and “（exp）coef” when you have a regression model?