Suppose that you have $8000 to invest. Which investment yields the greater return over 4 years: 6.6% compounded monthly or 6.7% compounded quarterly? Question 4 options: a) $8000 invested at 6.6% compounded monthly over 4 years yields the greater return. b) $8000 invested at 6.7% compounded quarterly over 4 years yields the greater return. c) Both investment plans yield the same return. d) None

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.