an online sells song for $1.20 each or entire album for $5.50 each. As a promotion for their 46th anniversary, the store gives you a $46 credit to spend. if you buy 20 songs, and spend the rest on albums

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