Grammarly DS 电面 + case study 面经

hr电面问得很简单，问问相关经验什么的。case study的数据给的json，提交时间很宽裕，但是要求完成时间是4个小时内啊吧。具体也不知道怎么操作控制时间。
. From 1point 3acres bbs
case study问了四个问题：

1. Show the daily active users over the month, including all users. A user is considered active if they pinged at least once on a given day.
2. Calculate the daily retention curve for users who used the app for the first time on the following dates: Feb 4th, Feb 10th, and Feb 14th. Also, show the number of users from each cohort.
3. Determine if there are any differences in usage based on where the users came from. From which traffic source does the app get its best users? Its worst users?
4. Separate from the data analysis, it would be great to hear your thoughts on the Grammarly product and what data-related projects/ideas you think we should be pursuing.

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最后一题很坑，我没啥想法，我有不知道人家有啥data，可以做什么project，感觉就是个骗idea的题，答好答坏都没啥卵用吧，这种评判感觉很主观。也许100%重要，也许骗一堆ideas白嫖，看小伙伴自己怎么看待了。

祝小伙伴们好运！辛苦码字求个大米呀