3. When you're building wealth through investing, the long-term growth is amazing. If you were to invest $350 per month at a 12% rate of return, how much money would
you actually contribute over 30 years? Over 40 years? How much of those totals would
come from the growth of your investments at 30 years? At 40 years?

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.