1.The data below shows the observed pollution indexes of air samples that are randomly chosen in two areas of a city. The pollution indexes of air are said to be normally distributed from both areas. Use a 95% confidence interval to determine if the mean pollution indexes of air are different for the two areas.

Area A Area B

2.92 1.84

1.88 0.95

5.35 4.26

3.81 3.18

4.69 3.44

4.86 3.69

5.81 4.95

5.55 4.47