3. KB
1000
829
Q
A
1000
78°
D
Let OA, OB, OC and O are rays in the anti-clockwise direction.
T
ZAOB = 2 COD = 1000, ZBOC = 820, ZAOD = 780.

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