Interpreting Box Plots

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Presentation transcript:

Interpreting Box Plots

Parts of box and whisker plot 25% of data here 25% of data here 25% of data here 25% of data here Highest Median Upper quartile or 3rd quartile Lower quartile or 1st quartile lowest

What is the lowest test score? What is the highest test score? What is the lower quartile score? What is the median score? What is the upper quartile score? What is the range of scores? What is the interquartile range of scores? 50% of the data is between what two scores? The lower 25% of the data is between what 2 scores? The upper 25% of the data is between what 2 scores?

Video https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6th-box-whisker-plots/e/analyzing-data-with-box-plots https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6th-box-whisker-plots/v/reading-box-and-whisker-plots https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6th-box-whisker-plots/e/box-plots

https://www. khanacademy https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6th-box-whisker-plots/v/interpreting-box-plots https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6th-box-whisker-plots/e/interpreting-quartiles-on-box-plots

What is the lower quartile (1st quartile) for TV time? What is the Interquartile range of Homework time? What is the range of TV time? Which box plot has the data more spread out?

Identify each statement as TRUE, FALSE or CAN NOT BE DETERMINED Some sophomores didn’t watch TV that month The TV box and whisker plot contains more data than the homework plot 25% of the sophomores spend between 48 & 60 minutes per night on homework 15% of the sophomores didn’t watch TV that month The TV data is more varied than the homework data The median time spent on homework was 60 minutes The Interquartile range of the TV data is 95 The range of the homework data is 190

The accompanying box-and-whisker plot represents the scores earned on a math test. What is the median score? (1) 75 (2) 70 (3) 85 (4) 77 What score represents the first quartile? (1) 55 (2) 70 (3) 100 (4) 75 c) What statement is not true about the box and whisker plot shown? (1) 75 represents the mean score (3) 85 represents the 3rd quartile (2) 100 represents the maximum score (4) 55 represents the minimum score A score of an 85 on the box-and-whisker plot shown refers to: (1) the third quartile (3) the maximum score (2) the median (4) the mean

The accompanying box-and-whisker plot represents the cost, in dollars, of twelve CD’s Which cost is the upper quartile? What is the range of the costs of the CD’s? What is the median? How many CD’s cost between $14.50 and $26.00? How many CD’s cost less than $14.50?