Which of the following actions could improve your credit score? A. transferring balances to multiple new credit lines B. paying down balances on current credit lines C. closing all your credit line accounts D. defaulting on a loan because you missed several payments already

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.