Write an inequality for the situation.

all real numbers y that are less than –3 or greater than 18

a) y < –3 or y < 18
b) y < 18 or y > –3
c) –3 < y < 18
d) y < –3 or y > 18

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables