A file will be created on your desktop called “Picture Y”, where “Y” represents a number. If the median is not part of the original data set then you just use the numbers on one side of the median depending on which quartile you are trying to calculate. Let me try the other set: The interquartile range is when you subtract the first quartile from the third quartile. Practice sorting by shape or by color. It is called a box plot. Have the students explore the questions on box plots by building the appropriate box plots either by hand or using the Box Plot activity.

If I include the median to calculate the quartiles then the first quartile is the average of 4 and 9 or 6. Let’s use 2 6 7 10 14 15 since it has an even number of numbers in the set, and then we can use 1 4 9 12 16 23 24 for an odd sized data set. These instructions should enable you and your students to print out results from your explorations, to annotate them, and to make them part of any assessment. Statistics and Probability The student demonstrates an ability to classify and organize data. It usually refers to the arithmetic mean, but it can also signify the median, the mode, the geometric mean, and weighted mean, among other things. For lists, the mode is the most common frequent value. An interactive illustration of creating a box plot. A bar graph such that the area over each class interval is proportional to the relative frequency of data within this interval.

If I include the median to calculate the quartiles then the first quartile is the average of 4 and 9 or 6. The learner will understand and use graphs and data analysis.

That’s right, the quantity of numbers on either side of the scale is the same. Summary of what, the data? Can you figure obx how we will calculate the third quartile?

It usually refers to the arithmetic mean, but it can also signify the median, the mode, the geometric mean, and weighted mean, among other things. For 2 6 7 10 14 15 the first quartile is equal to 6 and the third quartile equal to It looks something like this:.

User may choose to use or not use the median for calculation of interquartile range. Suggested Follow-Up If the students have not yet seen histograms, the lesson on Histograms and Bar Graphs makes a good follow-up. However, it gets a little tricky when you are trying to calculate the upper and lower quartiles of a data set in which the median is a number in the set.

Upon completion of this lesson, students will: It is better to avoid this sometimes vague term.

### Interactivate: Section 4: Box-and-Whisker Plots and Circle Graphs

Here’s a word problem that’s perfectly suited for a box and whiskers plot to help analyze data. Use and interpret box plots as a way to summarize large amounts of data. If you’re using “Paint”: Alternate Outline This lesson can be rearranged in several ways.

The median for the first set is 8. Includes video lessons and examples as well as practice problems with solutions. Do you know what the interquartile range represents?

Neither of these methods is considered standard over the other way of finding the upper and lower quartiles so your final answer will depend on which method you choose to use. Do you have any questions?

## Section 4: Box-and-Whisker Plots and Circle Graphs

Grade 9 Statistics and Probability The student demonstrates an ability to classify and organize data. We then use those five numbers in drawing our box plot. Let’s use interactivatr 6 7 10 14 15 since it has an even number of numbers in the set, and then we can use 1 4 9 12 16 23 24 for an odd sized data set. The data set may contain up to 15 integers, each with a pkot from 0 to Teams choose a question, then try to give the best answer.

You may also try using the help feature of your browser. You are absolutely correct. Now I would like to help you with another graphing method that allows you to compare different categories of data.

Also remember not to get median confused with the mean.

### Interactivate: Box Plot

If there is an even number of data points then the quartile is the average of the two middle numbers, just like when we found the median. What else do we need to complete our five number summary? The median for the second set is 12, the middle number.

We want to talk about the twenty-fifth and the seventy-fifth percentiles of the data. For more advanced students, The Bell Curvecovers the normal distribution and the bell curve controversy. Grades Data Analysis and Probability Formulate questions that can be addressed with data and collect, organize, and display relevant data to answer them Select and use appropriate statistical methods to analyze data.

Questions for the data sets can be found in the worksheet.