1. A nurse was hired by a governmental ecology agency to investigate the impact of a lead smelter on the level of lead in the blood of children living near the smelter in Bongo. Ten
children were chosen at random from those living near the smelter. A comparison group
of 7 children was randomly selected from those living in an area relatively free from
possible lead pollution. Blood samples were taken from the children, and lead levels
determined. The following are the results (scores are in micrograms of lead per
100 milliliters of blood): using a = 10% a two tailed- test, what do you conclude?
16
21
14
17
19
22 24
18
15
18
Lead Levels
Children Living
Near Smelter (X1)
Children Living in
Unpolluted Area (X2)
13
8
15
17
12
11
9