# Data analyst interview questions

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1. ABTest
Data analysis Bayes' theorem Probability Public

Your company is running a test that is designed to compare two different versions of the company’s website.

Version A of the website is shown to 60% of users, while version B of the website is shown to the remaining 40% of users. The test shows that 8% of users who are presented with version A sign up for the company’s services, compared to 4% of users who are presented with version B.

If a user signs up for the company’s services, what is the probability that she/he was presented with version A of the website?

Easy
10min

2. MarketingCosts
Data analysis Linear regression Python Public

Implement the desired_marketing_expenditure function which returns the required amount of money that needs to be invested in the new marketing campaign in order to sell the desired number of units, based on data about previous marketing campaigns in which the number of units sold lineraly depends on the amount of money invested.

For example, for the desired number of 60,000 units sold and previous campaign data from the table below, the function should return 250,000.

Previous campaigns
CampaignMarketing expenditureUnits sold
#1300,00060,000
#2200,00050,000
#3400,00090,000
#4300,00080,000
#5100,00030,000
Hard
20min

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