Problem 4 Gloria the grasshopper is working on her hops. She is trying to jump as high and as far as she can. Her best jump so far was 30 cm long, and she reached a height of 20 cm. Sketch a graph and write an equation of the parabola that describes the path of her jump

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.