It puzzles us, because this looks like a t-test, but it seems like we're comparing five different groups, which might indicate the use of an ANOVA. But we have no data for any within-group variation to produce a meaningful f value. We're not sure how to look at this in terms of a t-test either, because we are not comparing one or two samples and there doesn't appear to be any population parameters available.

Her advisor said this was supposed to be very easy, very basic statistics, but we've been going through a number of stats books and are really struggling with finding the right strategy for this context. Any help would be appreciated. We are getting desperate.

Thanks