Question

study background: study graph: lead content in gasoline and average blood lead levels what can be concluded from this graph? removing lead from gasoline in the 1970s was an ineffective policy regulation. there is a correlation between blood lead levels and the use of lead in fuel. people should strongly minimize their exposure to lead while filling their gas tanks. running errands without consolidating trips does not affect lead exposure.

Explanation:

Looking at the graph, as the lead used in gasoline (represented by one line) changes over the years, the average blood lead levels (represented by the other line) follow a similar trend. This shows a relationship or correlation between the two variables. The first option is wrong because the graph shows a decrease in both lead in gasoline and blood lead levels, indicating the policy was effective. The third option about minimizing exposure while filling gas tanks is not supported by the graph which shows a general trend over time for overall lead use and blood levels. The fourth option about trip - consolidation is also not related to the data presented in the graph.

Answer:

There is a correlation between blood lead levels and the use of lead in fuel.