﻿[Script Info] Title: [Events] Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text Dialogue: 0,0:00:00.24,0:00:03.74,Default,,0000,0000,0000,,So let's look at an example of deductive reasoning. So Premise A, is all mass Dialogue: 0,0:00:03.74,0:00:09.67,Default,,0000,0000,0000,,creates gravity. And Premise B, is all objects have mass. Therefore, all Dialogue: 0,0:00:09.67,0:00:14.52,Default,,0000,0000,0000,,objects create gravity. Because if all mass has gravity and all objects have Dialogue: 0,0:00:14.52,0:00:19.71,Default,,0000,0000,0000,,mass, then they must create gravity. Notice that the logical conclusion has to Dialogue: 0,0:00:19.71,0:00:24.81,Default,,0000,0000,0000,,be true if the 2 premises are true. We know, however, that this type of Dialogue: 0,0:00:24.81,0:00:28.59,Default,,0000,0000,0000,,reasoning can lead to correct conclusions only when the general premises to Dialogue: 0,0:00:28.59,0:00:34.36,Default,,0000,0000,0000,,which they are based are true. Let's look at another example. Premise A,is I Dialogue: 0,0:00:34.36,0:00:40.32,Default,,0000,0000,0000,,don't know math. Premise B is, I can't learn math. Therefore, I shouldn't even Dialogue: 0,0:00:40.32,0:00:45.05,Default,,0000,0000,0000,,bother trying to learn math". We see, here, that this reasoning leads to a Dialogue: 0,0:00:45.05,0:00:50.33,Default,,0000,0000,0000,,false conclusion, because premise A is false. And so is premise B. So, even Dialogue: 0,0:00:50.33,0:00:55.31,Default,,0000,0000,0000,,though the argument is. Easily structured in the same way. One leads to an Dialogue: 0,0:00:55.31,0:01:01.56,Default,,0000,0000,0000,,accurate conclusion, and one, this one, does not. Deductive reasoning is what Dialogue: 0,0:01:01.56,0:01:05.88,Default,,0000,0000,0000,,scientists use when we make predictions for our general goals. Now let's go to Dialogue: 0,0:01:05.88,0:01:07.90,Default,,0000,0000,0000,,Susan and talk about inductive reasoning.