Can we build a model to determine whether or not a Facebook ad was created by a bot based on the text it contains? Classification. Predictive. We would train our model on data gathered from https://github.com/russian-ad-explorer/russian-ad-datasets and Facebook's ad database.
Can we build a model to determine how much the geography/topography of Portland influences its transportation infrastructure? Regression. Descriptive. We would use data from http://www.civicapps.org/datasets to build the model.
Can we build a model to predict future mortality rate or the incidence of a certain disease in a country based on other data about the country? Regression. Predictive. We would train our model on data from https://stats.oecd.org/Index.aspx?ThemeTreeId=9 and https://www.who.int/healthinfo/statistics/en/.