senior data scientist interview questions shared by candidates
How would you test if survey responses were filled at random by certain individuals, as opposed to truthful selections?
I would design the test in a way that certain information is asked two different ways. if two answers disagree with each other I would seriously doubt the validity of the answers.
This is a very basic psychometrics question. Calculate Cronbach's alpha for the survey items. If it is low (below .5), it is very likely that the questions were answered at random.
We need to find the histograms of the questions in the survey to see the distribution of each answer in each question. All question histograms will likely follow the normal distribution if they are truthful selection. If one response with more than of half of total answers being located outside of 95% confidential interval in each histogram, the response will be categorized as random fall out of mean plus tw
Case 1: Given APR, Interchange fee, Avg monthly balance, Avg spend every month, and loss rate of 3% calculate the profit per customer. Now justify if it is profitable to give cash back to the customers.. Case 2: 2 ways of campaigning for credit cards 1. Email - 10% of applicants become customers - each representative can verify 10 email applications in an hr and is paid $25/hr 2. Chat - 20% of applicants become customers - each representative can respond to 4 applications in an hr and is paid $25/hr Profit per customer in both the cases in $100. which one is profitable email or chat. Draw the graph of profit vs no of applicants Consider a scenario where there are only 5 representatives to handle applications. In this case which one is more profitable email or chat. calculate the breakeven point for the no of representatives where chat will be profitable than email.
Prepare 6-7 situations for behavioral questions and be flexible if they questions is not asked in the way as you are prepared. Try to find the character they asked from your prepared examples. Cases are easy, if you make mistake and feel your answer is awkward, ask for help and modify your calc. I did make a mistake. It was a typo carried to next step's calc. And I found out and asked for help, and found out what's wrong with the formula I wrote.
case study: credit card insurance profit per customer cost of mailing $0.5, response rate 1%, average balance per month $1000, insurance charges 1% of average balance monthly, customer claim rate 5% (once insured customer files a claim, the balance will be wiped and C1 lose $1000). Question: profit per customer, graph claim rate vs response rate, graph profit vs response rate and find the response rate for maximum profit (r=1%)
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