Which of the following equations represents the line with a slope of negative 1/7 and a y-intercept of negative 3? a. y = -1/7x - 3 b. y = 1/7x - 3 c. y = 1/7x + 3 d. y = -1/7x + 3

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