Biology 2244A/B Study Guide - Midterm Guide: Descriptive Statistics, Foodborne Illness, Tasmania

• School: Western University
• Department: Biology
• Course: Biology 2244A/B
• Professor: Angela White

Document Summary

The incubation periods (in hours) for 8 people who developed food poisoning after consuming contaminated salad are listed below. Use the procedures as described in lecture materials for 2244. There are 8 observations so the median is the average of the middle two: median = 20. 5. This divides the data into two equally-sized halves. The median is not one of the observations so it should not be included in the top and bottom halves to calculate the quartiles. Bottom half of the data: 14 18 19 20 (q1 = 18. 5) Top half of the data: 21 28 36 43 (q3 = 32) Answer: iqr = q3 - q1 = 13. 5 (b) The (cid:373)a(cid:374)ufa(cid:272)tu(cid:396)e(cid:396) of (cid:858)s(cid:374)a(cid:272)k pa(cid:272)k(cid:859) (cid:894)i. e. fou(cid:396) (cid:272)(cid:396)a(cid:272)ke(cid:396)s (cid:449)(cid:396)apped togethe(cid:396)(cid:895) p(cid:396)e(cid:373)iu(cid:373) plus crackers is interested in the similarity in mass of crackers within a snack pack. To examine this issue, he weighs two crackers from each snack pack for 60 packs.