# Measures of Central Tendency & Variability

Videos and lessons to help Grade 7 students learn how to use measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.

For example, decide whether the words in a chapter of a seventh-grade science book are generally longer than the words in a chapter of a fourth-grade science book.

Common Core: 7.SP.4

### Suggested Learning Targets

- I can make informal comparisons of data about two
populations.
- I can compare two sets of data using measures of
center (mean, median, mode) and measures
of variability (MAD and IQR).

Related Topics:

Common Core for Grade 7
Common Core for Mathematics
More Math Lessons for Grade 7
Using measures of center and variability to draw informal comparative inferences--1 of 4 (7.SP.4)

In this lesson you will learn how to informally compare two populations by using the mean.

Using measures of center and variability to draw informal comparative inferences--2 of 4 (7.SP.4)

In this lesson you will learn how to informally compare two populations by using the median.

Using measures of center and variability to draw informal comparative inferences--3 of 4 (7.SP.4)

In this lesson you will learn how to informally compare two populations by using the range and interquartile range.

Using measures of center and variability to draw informal comparative inferences--4 of 4 (7.SP.4)

In this lesson you will learn how to informally compare two populations by using the range and interquartile range.

Determine which measure of central tendency to use - 7.SP.4

In this lesson, you will learn which measure of central tendency best describes a set of data by looking at test scores for a group of students.

Measures of Center

Sarah wanted to figure out if she did better on tests by studying 2 more hours or by sleeping 2 more hours. She charted her results for 10 different tests. Based on the data, should Sarah study more or sleep more the night before a test?

You can use the Mathway widget below to practice Statistics or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.