Percentiles and Data for Box & Whisker Plots

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Presentation transcript:

Percentiles and Data for Box & Whisker Plots

Example (3.4 # 1). Angela took a general aptitude test and scored in the 82nd percentile. What percentage of scores were at or below her score? What percentage of scores were at or above her score?

Example (3.4 # 2). One standard for admission at Redfield College is that the student must rank in the upper quartile of his or her graduating class. What is the minimal percentile rank of a successful applicant?

Example. Clayton and Thomas took two different GRE subject tests Example. Clayton and Thomas took two different GRE subject tests. Thomas answered 83% of the questions correctly and scored a 75th percentile, while Clayton answered 61% of the questions and scored at the 93rd percentile. Which student performed better relative to the others taking the tests?

Example. Sylvia scored at the 98th percentile on her GRE subject test Example. Sylvia scored at the 98th percentile on her GRE subject test. If 5000 people total took the test, approximately how many scored better than Sylvia? Approximately how many scored worse than Sylvia?

Data for 3.4 # 8 (ordered) Example. Length in months at current position. 3 6 7 14 15 17 18 20 22 24 25 26 29 31 32 42 72 Construct a box and whisker plot for this data.

Data for 3.4 # 10 (ordered) Example. Percentage of high school dropouts by state. 5 6 7 8 9 10 11 12 13 14 15 Construct a box and whisker plot for this data.