3. A math teacher wants to test her students memory by seeing how many Greek letters her students could remember. She gives 16 of her students the list of all 24 Greek letters and 15 minutes to memorize them. Each student was asked to list as many as they could an hour later and 24 hours later (the next class). Is there evidence that the mean number of Greek letters remembered after one hour exceeds the mean number remembered after 24 hours by at least 2 letters? 1 hour 20 15 12 16 17 22 19 18 17 14 20 19 16 16 18 17 24 hours 14 14 10 15 13 18 16 16 13 14 16 14 13 14 16 16