1. Which Biconditional is not a good definition? A: Two angles are supplementary if and only if the sum of their angles measures 180
B: Two angles are vertical angles only if they are not adjacent to each other are formed by two intersecting lines
C: Two angles form a linear pair if and only if the angles are adjacent
D: The sum of two angles if 90 is and only if those two angles are complementary

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