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Protecting wood How can we help wood surfaces resist weathering, especially when zestoring historic wooden buildings? In a study of this question, researchets prepared wooden panels and then exposed them to the weather. Here are some of the ~ variables recorded: type of woad-(yellow poplar, pine, cedar); type of water repellent (solvent-based, water-based); paint thickness (millimeters); paint color (white, gray, light blue); weathering time Gnonths). Identify each variable as categorical or quantitative. \: +ype ot weed, type. Wwede- repellent Coches orics Peank color Quarks fehue ¢ Paint thickness w eather a4 +i ine i Multiple choice|Select the best answer. Exercises 7 and 8 refer to the following setting. At the Census Bureau Web site, you can view detailed data col- Introduction Data Analysis: Making Sense of Data 7 Zz il A class survey Here is a small part of the data set that a describes the students in an AP Statistics class. The data come from anonymous responses to a question- naire filled out on the first day of class. Pocket Height Homework Favorite change Gender Hand {in) time (min) music (cents) bo 65 200 Hip-hop 50 M Lo 72 80 Country a5 a M R 62 95 Rock 35 F L 64 120 Alternative 0 M R 63 220 Hip-hop. G F R 58 60 Alternative 76 nfs R oF 150 Rock 25 + (a) What individuals does this data set describe? (b) Clearly identify each of the variables. Which are quantitative? In what units are they measured? @ Andis. deals: AP Statistics stdests Hrk Compleded. Survey Kb) Vomdbtes: +e gone od 2 Coantimryé D height Cin) Z) time spert on HW Can) lett i tighe Wended contacted by the survey. “School” gives the highest tevel of education comple ° Travi on B Weight Agi to work (Ib) (yr) (min) School 18766 0 Ninth grade 15866 na High school grad 0 176 54 10 Assoc. degree 11,900 339 a7 10 Assoc. degree 6,000 1 7 10 Some college 30,000 16518 nla High school grad Q 213 38 15 Master's degree 125,000 194 40 0 High schoo! grad 800 221 18 20 High schoo! grad 2,500 1 va ‘Filth grade 0 193 ender 3) Favorite mysic @ pocket cheoge €'s)_ ~ fl rma individuals thir data'set are a) households. (d) 120 variables. ((b))people. (e) columns. (e) adults. fal ‘This data set:contains (a) 7 variables, 2 of which are categorical. {b) 7 variables, 1 of which is categorical. }6 variables, 2 of which are categorical. (d) 6 variables, 1 of which is categorical. (e) None of these. 
