1. Which of the following constructions would help to construct a line passing through point C that is perpendicular to the line AB?
C с
A
B
A. Construction of an equilateral triangle with one side AB
B. Construction of a hexagon with one side BC
C. Construction of a perpendicular bisector through C
D. Construction of a square with one side AB

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