The company developed a new feature and perform A/B test. Here is the result Comments +5% Likes -10% Timespent +1% All else neutral How would you decide to whether putting into product based on the A/B test result? Any ideas?
Data Interview Questions
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Question 1: # Complete a function that returns the number of times a given character occurs in the given string # For example: # - input string = "mississippi" # - char = "s" # # - output : 4 """
Three greatest strengths and weaknesses.
There are 50 cards of 5 different colors. It comprises of 10 Red cards, 10 blue cards, 10 orange cards, 10 green cards and 10 yellow cards. Each color will have the cards numbered between 1 to10. You pick 2 cards at random. What is the probability that they are not of same color and not of same number.
There's a game where you are given two fair six-sided dice and asked to roll. If the sum of the values on the dice equals seven, then you win $21. However, you must pay $5 to play each time you roll both dice. Do you play this game? And in follow-up: What is the probability of making money from this game?
How do you calculate monthly active users, churned users and resurrected users from a user activity log with userID and DateTime
do you work
Given a table of friend requests sent and friend requests received, find the user with the most friends.
data question: dialoglog (userid int appid int type char , a flag either "imp" or "click" ds timestamp ) How would you access the quality of app? How to compute click-through rate (in mySQL)?
SQL question: given a table of interaction between users (user_a | user_b | day), find number of users who had more than 5 interactions yesterday (assume there is only one unique interaction between a pair of users per day). Product Question: A user satisfaction survey was conducted for two groups of facebook users (each with 50 k sample size). Group1: who had enabled certain login security features Group 2: who had not enabled these security features. It was found that user satisfaction with group1 was 30% lower than with group 2. Why do you think so? Comment on how the survey was conducted?
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