Data analyst interview questions

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1. ABTest
Data analysis Bayes' theorem Probability Public New

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
Solve question

2. MarketingCosts
Data analysis Linear regression Python Public New

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.

The data from previous marketing campaigns can be used to evaluate how 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
Easy  
20min
Solve question

3. StockPrices
Data analysis Correlation Data aggregation Python Public New

You are given a list of stocks and their daily closing prices for a given period of time. Your task is to determine which pair of stocks had the most highly correlated daily percentage changes of closing prices.

DAY

GOOG

FB

MSFT

AAPL

1

742.66

108.40

55.40

106.00

2

738.40

107.92

54.63

104.66

3

738.22

109.64

54.98

104.87

4

741.16

112.22

55.88

105.69

5

739.98

109.57

54.12

104.22

6

747.28

113.82

59.16

110.16

7

746.22

114.03

58.14

109.84

8

741.80

112.24

55.97

108.86

9

745.33

114.68

61.20

110.14

10

741.29

112.92

57.14

107.66

11

742.83

113.28

56.62

108.08

12

750.50

115.40

59.25

109.90

Easy  
30min
Solve question

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