Lesson 7: 1.7 Measuring Variability

What does the range tell us about the spread of the data?

What does the standard deviation tell us about the spread of the data?

What does the interquartile range tell us about the spread of the middle 50% of the data?

Range
Standard Deviation
Quartiles
Interquartile range

HSS.ID.A.2
Use statistics appropriate to the shape of the data distribution to compare center (median, mean) and spread (interquartile range, standard deviation) of two or more different data sets.

Students will be able to calculate and interpret the range, standard deviation, and interquartile range of a data set.
Students will be able to choose the appropriate measure of spread for a given data set.

Lesson App page 68: Why are there so few chips in the bag?

Common error is including the median in the lower half to calculate quartiles

For advanced students: Introduce the concept of variance and its relationship to standard deviation.

For struggling students: Provide additional support and simplified data sets.

Teacher assigns examples from the textbook and other resources.

Access E-book through Classlink