Mckinsey数据科学面试真题

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全部(22)
A/B testing(0)
Statistics(10)
Product Case(4)
Coding(4)
Modeling(3)
高频题(0)
1.Effective way to increase production capacity
2.improve profitability
3.normal distribution mu+-3sigma 对应范围
4.log-normal distribution
5.s^2计算分母n-1
6.poisson distribution
7.Strictly Positive
8.Testing Encryption Validity
9.Predicting the temperature
10.How to know if a company is competitor
11.Improve revenue
12.Payable amount
13.Find smallest divisor
14.Predict temperature
15.learn rate/batch size for stabling loss
16.Linear regression
17.activation functions on gradient vanishing
18.how to regularize decision tree model
19.PCA
20.Performance metric for classifier on imbalanced dataset
21.K-Means,Random Forest etc
22.Predict sales
1. Effective way to increase production capacity
 | Your client is Various Chocolate company. It manufactured chocolate in America. One of
 its products, called Chocolate nuts, is a seasonal product selling specifically during
 eastern, Christmas, and Halloween. Chocolate nuts come from a factory located in a small town in Washington. Now it's facing an increasingly demanding and Various Chocolate decided to increase the production in this product.
 What issues do your clients need to consider if they decide to increase their production capacity?
 Maths:
 Demand:55 Million per pound
 Various Production Capacity:
 Each Batch circletime:3.5 hr
 50,000 pound per batch
 Q: What is the gap between their capacity and demand?
 Hidden Information:
 One shift per day. 8 hr with 30 lunch break and two 15 minuster break
 300 working days every year
 Following question 1:
 Acuatal output is 1.9 million. What causes the gap between actual and theoretical capacity?
 Follwoing question 2:
 Now we aussume we solve the capacity problem, and reach the max prodcution capacity.
 If you run into the CEO in an elevator, What would you suggest to he/she as a best
 effective way to increase the production capactiy?
2. improve profitability
 | Your Client is Polar Air, a mid-size Scandinavian airline. The airline has 100 aircraft, 20000 employees worldwide. Its considered to be “best practice" in terms of its financial and operational standing. In particular, Polar Air has a strong cash flow and nearly zero debt which is uncommon in the Airline industry. The airline considers business passengers, to and from its main hub, to be its core market. Additionally, the company also gets a good amount ofit' s revenue from connecting traffic from continental Europe and North America to Asia via the North Pole, which makes it' s flight shorter.Lately profitability has gone down Polar Air has done little to reverse the negative trend. In addition, the airline and from its main hub, to be its core market. Additionally. the company also gets a good amount of it' s revenue from connecting traffic from continental Europe and North America to Asia via the North Pole, which makes it' s flight shorterLately profitability has has been ignoring the rapidly forming trend toward global airline alliances.Now, facing a downturn in the Airline Industry, Polar Air is facing the risk of falling in a downward spiral in the face of stiffer competition from these global alliance networks.
 Q1: What should Polar Air Link do to improve its current profitability problem? What
 opportunity might PolarAir explore to improve its profitability
3. normal distribution mu+-3sigma 对应范围
 | normal distribution mu+-3sigma 对应范围
4. log-normal distribution
 | log-normal distribution
5. s^2计算分母n-1
 | s^2计算分母n-1
6. poisson distribution
poisson distribution应用
7. Strictly Positive
 | Strictly Positive
8. Testing Encryption Validity
Testing Encryption Validity
9. Predicting the temperature
Predicting the temperature
10. How to know if a company is competitor
 | 一个造车公司面临一个竟争对手,问怎么确定对方是真的竞争对手
11. Improve revenue
 | 一个厨具公司的现有客户revenue降低了,怎么提升。
12. Payable amount
X has list of items to purchase at market. Owner offers discount each item after the first one by the lowest market price among the prior items. No items price can be lower than 0, and list of items may not be reordered. You need to obtain the payable amount.
13. Find smallest divisor
 | Given 2 strings s and t. you should create a function findsmallestDivisor that operates per:
 - find whether string s is divisible by t (a: if s is divisble find smallest string u s...t. it can be concatinated some number of times to obtain both s and t b:if not divisable set it to value-1)
 -return the lengtyh of the tring u or -1
14. Predict temperature
 | Given hourly temperature data for each 24h period in p prior days from startDate to endDate predict the temperature of the following day.
15. learn rate/batch size for stabling loss
 | learn rate/batch size for stabling loss
16. Linear regression
 | Linear regression property
17. activation functions on gradient vanishing
 | activation functions on gradient vanishing
18. how to regularize decision tree model
 | how to regularize decision tree model
19. PCA
 | PCA
20. Performance metric for classifier on imbalanced dataset
 | Performance metric for classifier on imbalanced dataset
21. K-Means,Random Forest etc
 | K-Means,Random Forest etc
22. Predict sales
 | In this case about pharmaceutical that wants to predict sales. The interviewer will ask you some usual questions such as model, data, features, unit analysis etc.