Unit 5, Lesson 22# Comparing Two or More Populations with Sample Data (Complete)

EngageNY 45 min(s)

Students express the difference in sample means as a multiple of a measure of variability. Students understand that a difference in sample means provides evidence that the population means are different if the difference is larger than what would be expected as a result of sampling variability alone. In previous lessons, seventh graders have been challenged to learn the very important roles that random sampling and sampling variability play in estimating a population mean. This lesson provides the groundwork for Lesson 23, in which students are asked to informally decide if two population means differ from each other using data from a random sample taken from each population.