Mrs. Phillips is grading the semester exams for her Advanced Algebra course.

She wants a visual representation of how the grades are spread throughout the class.It would also be helpful to know where the upper 25% of grades are located. Below is the box-and-whisker plot she designed. Explain, using complete sentences, whether or not this is the most appropriate format for representing this data and why.

Question

rhiams rhiams

14-10-2016
Mathematics

Answered

Mrs. Phillips is grading the semester exams for her Advanced Algebra course.

She wants a visual representation of how the grades are spread throughout the class.It would also be helpful to know where the upper 25% of grades are located. Below is the box-and-whisker plot she designed. Explain, using complete sentences, whether or not this is the most appropriate format for representing this data and why.

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Aliwohaish12 Aliwohaish12 · Answer 1 · 2016-10-14T09:46:08-04:00

This is a very good visual representation. Whether it is the best, or not, depends on the purposes:

First, you can see right away where the top 25% (4th quartile) scored by looking at the right hand whisker.

Second, you get two measures of variation for the data, the range and the interquartile range. Finally, by looking at the left whisker, you can see that most of the variation comes from the bottom quartile: 3/4 of the students scored between 80 and 100, while 1/4 scored between 80 and 50.

As a teacher, I would want more detail about the bottom quartile. It might be that one student scored 50 and everyone else scored between 70 and 80. But I wouldn't need to have it graphically represented. This graph shows me that the class overall is in good shape: The median is close to 90. But there is at least one student, and up to 25 % of the class who did poorly on an exam that otherwise looks very easy.