Ways to Measure Central Tendency
Name _________________________________
Period _______ Date ___________________
|2.1 Describing Location in a Distribution |
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|Percentiles |
| | |
|Definition | |
| |25th percentile |90th percentile |50th percentile |
|Distribution Examples | | | |
| |
|Problem 1 – More Test Scores |
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|The test scores from a particular AP Stats exam are as follows: |
|72 73 73 74 75 77 77 77 78 79 79 80 80 81 82 83 83 83 84 85 86 89 90 93 |
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|Construct a stemplot of the data. |
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|In what percentile does a student fall if they score an 86 on the exam? |
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|In what percentile does a student fall if they score a 72 on the exam? |
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|Problem 2 – Wins in Major League Baseball |
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|The stemplot below shows the number of wins for each of the 30 Major League Baseball teams in 2009. |
|5 9 |
|6 2455 |
|7 00455589 |
|8 0345667778 |
|9 123557 |
|10 3 |
| |
|Calculate and interpret the percentiles for the Colorado Rockies who had 92 wins, the New York Yankees who had 103 wins, and the Cleveland Indians who had |
|65 wins. |
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|How many games did a team in the 60th percentile win? |
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|Relative Frequency and Ogives | |
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|Median Income* |
|Frequency |
|Relative Frequency |
|Cumulative Frequency |
|Cumulative Relative Frequency |
| |
|35 to ................
................
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