Interview Question

Find the median of a large dataset.

Design a system to find top ten twitter hashtags in the most recent 1 min, 10 min, 1 hr.

What would you change in Twitter app? How would you test if the proposed change is effective or not?

Let’s say we want to roll out a new push notification system to see if we can retain more users. How would we go about doing this?

What features would you use to build a recommendation algorithm for Twitter users?

what is the most challenging aspect of what you do now Describe a recent data science project you have worked one.

Infection rates at a hospital above a 1 infection per 100 person-days at risk are considered high. A hospital had 10 infections over the last 1787 person-days at risk. Give the p-value of the correct one-sided test of whether the ...

Outcome of an experiment 5% of one group clicks more. Is that a good result?

How to correct for biases in your data?

Given measurements of acceleration taken from a wristband, with second by second acceleration in the X, Y, Z axis, how would you predict if the person wearing the wrist is sitting, walking or just standing?