If option A is 20 dollar payment and option B requires 50 dollar. the opportunity cost of option A would be and option B would be . a) nothing and 30 dollar
b) 70 dollar and nothing.
c) 30dollars and nothing.

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