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Unformatted text preview: nce Examination Board and Educational Testing Service. All rights reserved. AP is a registered trademark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines Question 3 Solution a. Two histograms, drawn to the same scale or on the same axes. Can use either frequency or relative frequency since the sample sizes are equal (500). 71 40 Frequency 54 49 50 34 31 30 17 60 54 50 39 40 10 39 29 30 17 20 9 73 69 70 60 20 83 80 70 70 93 90 78 80 Frequency 100 87 90 10 4 0 0 1 2 3 4 5 6 7 8 9 1 10 2 3 4 5 6 7 8 9 10 flexibility (young) flexibility (middle-aged) 100 90 80 70 freq 60 50 40 30 20 10 0 freq (middle-aged) freq(young) 1 2 3 4 5 6 7 8 9 10 flexibility rating Other possibilities include boxplots or frequency polygons, if done correctly. For example, Boxplots: Frequency Polygons: 100 5 7 90 8 80 1 10 6 4 7 10 1 middle-aged 70 Frequency age young 60 50 40 30 20 10 0 1 0 1 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 flexibility flexib ility --- young __ middle-aged Papers that use cumulative frequency plots (ogives) may also be acceptable. These papers should be referred to a table leader. Ideally graphs include scales, labels, title and legend. Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved. AP is a registered trademark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines If a student supplies the following graph, you should grade this problem holistically. 100 middle-aged 90 young 80 70 frequency 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 9 10 Flexibility Judge from the answer to (b) whether the student is interpreting this as a frequency polygon or a scatterplot. • With correct interpretation as a frequency polygon, the paper could be a 4. • With weak or unclear interpretation as a frequency polygon, could be a 3. • With mixed interpretations (e.g. association and shape), could be a 2. • With interpretation as scatterplot (e.g. positive association/correlation), could be a 1. b. Th...
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This note was uploaded on 09/06/2013 for the course MATH AP Statist taught by Professor Mosby during the Spring '13 term at Silverton High School, Silverton.

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