Complete the in-text lab located in the textbook on pages 528-529 in the online version (available by scrolling to the end of the 20.2 PDF).

Read the introduction.

Complete the procedure, steps 1-3, where you formulate a hypothesis** and construct a graph. The graph should be a LINE graph, and there should be 5 lines, one for each age group. Be sure to include a key for your graph that shows which line corresponds to which age group.

**sample hypotheses: As blood-lead concentration increases I expect a person's IQ to ____________________. As the children grow older, I think that ______________________.

Complete the analysis questions.

Complete the conclusion questions.

Complete the extension question.