Which of the following is a correct interpretation of the expression 2 − ( − 7 ) 2−(−7)2, minus, left parenthesis, minus, 7, right parenthesis? Choose 1 Choose 1 (Choice A) A Start at 2 22 on the number line and move 7 77 to the left (Choice B) B Start at 2 22 on the number line and move 7 77 to the right (Choice C) C Start at − 7 −7minus, 7 on the number line and move 2 22 to the left (Choice D) D Start at − 7 −7minus, 7 on the number line and move 2 22 to the right

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