Illustrative Math - Algebra 2 - Unit 7 - Lesson 2

What type of study would you conduct if you wanted to know how many hours a week on average students at your school spend on homework? Explain your reasoning.

Tags

S.IC.3

S.IC.1

S.IC.6

Select all designs which describe an observational study that is not a survey.

• 200 voters are randomly selected and asked how they will vote in the upcoming election.
• 60 pieces of lumber are randomly selected. Half of those are randomly assigned to be treated with a new sealer. Three months later the level of rotting in all the pieces is recorded.
• 100 pregnant women are randomly selected. For 8 weeks, the level of iron in their blood and their vital signs are recorded.
• 400 incoming sixth grade students are randomly selected. Researchers record their results on a reading test at the beginning and end of the school year and compare the level of improvement seen in students at elementary schools to students at middle schools.
• 300 people apply to test a new mattress. 100 of these customers are selected randomly to receive the new mattress and the others are given an older version. After 6 months they are asked to rate their satisfaction with the mattress.

Tags

S.IC.3

S.IC.1

S.IC.6