# TRAFFIC ACCIDENTS ON I-10 VS I-12

### Lesson 12

This is an activity to develop inferences about the difference between the means of two populations. Students are given 17 data values and are asked to follow instructions to collect data from three more random samples. Then students will determine the sample means and variances and a confidence interval. During a follow up period students can be asked to write a report on their findings geared to a layman audience. Students could alternatively work with only the 17 data points that are provided if the class does have the time needed to collect three additional data values. On the other hand, if each group obtains its own three data values, then each group will have a slightly different confidence interval and that will make the student debrief more interesting.

### Teacher Materials

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