The main difference between a strong argument and a valid argument according to Epstein is that a strong argument can have a plausible premise with a false conclusion at the same while a valid argument must have both true premises and a true conclusion.
A real life example of a valid argument would be the minimum age for a licensed driver is sixteen therefore all legal drivers on the road are at least sixteen years old. This argument is valid because both the premise and the conclusion are true.
An example of a strong argument would be spending a day at the beach with friends is relaxing. Today is a good day for that because sun is out, there are no clouds, and it's not too windy therefore a day at the beach will be relaxing. This argument is strong because its premises can be validated as true and so can the conclusion. But the conclusion can also be false because the weather could change later in the day. Also all of the premises have to do with the weather and do not include factors such as having enough food, transportation, or activities at the beach.
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