presumes, without providing justification, that what is true of a whole must also be true of each
This describes one of the 10 Famous Flaws, Part vs. Whole, in which the author establishes that a trait applies to a part/whole and then concludes that the same trait must apply to the whole/part. We need to keep track of whether an answer is saying the argument went from Part to Whole or from Whole to Part. This answer says, "the author presumes that what is true of X must also be true of Y". That indicates that X is the given and that applying that idea to Y is the overstretched conclusion. Did the evidence establish that something is true of a whole? No, the two premises are: - any individual course that teaches you how to write will serve you well - some individual philosophy courses teach you how to write Both premises are about individual courses. We might be tempted by this thinking, "Yo, author --- you're assuming that because teaches you to write is true of some individual Philosophy classes that it's true of all Philosophy classes". And that might feel like a Part vs. Whole distinction. But there are two problems 1. Since the conclusion is about all/any philosophy classes, and the evidence is about some individual philosophy classes, this argument would be making a move from Part to Whole. This answer choice accuses it of moving from Whole to Part. 2. It's not actually Part vs. Whole when you're saying, "Because X was true of these A's, X will be true of all A's." i.e., because this cheerleader was spunky, all cheerleaders are spunky. That's not a Part to Whole flaw. That's Sampling. When author assume "these data points must be similar to other data points (even the set of all data points)" that's sampling. If it's true of this cheerleader, it's true of every single cheerleader. Part vs. Whole has to involve a switch to a collective concept. "All cheerleaders" isn't a collective concept. It's a universal statement about individuals. Part vs. Whole would sound like, i.e. because Pam is part of the cheerleading squad and Pam can't afford to charter a bus, we can conclude that the cheerleading squad as a whole can't afford to charter a bus. (our objection would be like, "if everyone's money is pooled together, maybe then they could afford the bus?") Sampling would be saying, because Pam is a cheerleader and can't afford to charter a bus, all cheerleaders on the squad can't afford to charter a bus. (our objection would be like, "maybe Pam is atypically lower-income for a cheerleader, or maybe there is some atypically rich cheerleader on the squad who could afford the bus". )