Eddie is fishing. He has ounces of weight on his line, but his bait isn't getting to the bottom of the lake. Eddie adds another -ounce weight to the line, but it's still not enough. Finally, Eddie adds a -ounce weight and the bait sinks. How much weight does Eddie now have on his line?

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.