Hi, I just had a question about categorical vs. quantitative variables. 

If test scores of a class are collected in ranges (e.g. 70s, 80s or 90s), 

would that be categorical since 70s, 80s, and 90s are technically categories?

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It depends on the data collected. 

1. data: 71, 82, 86, 88, 91 (i.e. specific scores) => this is quantitative

2. data: 70s, 80s, 80s, 80s, 90s (i.e. categorized labels) => this is categorical

By nature, test scores are quantitative, since they are numerical, but they can be turned into categories, after which process they would lose their quantitative properties. For example, in the above example case 1 would have a mean, but for case 2 calculating mean would not be possible.

P.S. Sorry it took too long to respond, I had a personal matter to take care of which took a lot of time. Will be more prompt on the replies :) Hope you have a good time with the course.