110_lec08_Distributions

# 110_lec08_Distributions - Suppose you were asked to sketch...

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Suppose you were asked to sketch the % of students who made the following grades on our Exam 1 using a bar graph. A 20 B+ 3 B 13 C+/C 8 Below C 5 TOTAL 49 (Fall 2008 Data) *First, find the % of students for each letter grade.

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GRADE COUNT PERCENT A 20 41 B+ 3 6 B 13 27 C+/C 8 16 Below C 5 10 TOTAL 49 100
Exam 1 Score Distribution - Fall 2008 0 5 10 15 20 25 30 35 40 45 A B+ B C+/C Below C Grade Percent

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English 101 Final Exam Scores [50,60),[60,70),[70,80),[80,90),[90,100]
A histogram presents the distribution of a quantitative variable. Steps to create a histogram: (1) Create categories. (2) Count number of values in each category. (1) Draw histogram with a bar for each category. The height of a bar represents the count for that bar’s category. Be careful: (1) Number of categories can’t be too large or too small. (2) Don’t skip any categories. (3) Be clear about contents of each category.

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52 73 83 56 74 85 64 75 86 64 77 88 64 78 90 69 78 91 71 79 98 71 81 72 83 English 101 Final Exam Scores Data
Frequency & Relative Frequency Tables Data Category Freq Rel. Freq (50,59) 2 2/25 = .08 (60,69) 4 4/25 = .16 (70,79) 10 10/25 = .40

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## This note was uploaded on 02/16/2011 for the course STAT 110 taught by Professor Johnson during the Spring '07 term at South Carolina.

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110_lec08_Distributions - Suppose you were asked to sketch...

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