Breaking down what they ask for in that presentation for the interview, and I'm realising that it would basically be a day or two actual work if it was happening in a professional office / project situation.
You're talking a good day of data cleansing and processing from raw data set, to something workable, and then a second day of transforming and figuring out what sort of story it tells and visualising it. At a minimum. Before even starting on putting it into a 10 minute presentation that makes sense.
At home. With only open source software.
Snark. Grumble.