Major League Soccer (MLS) rules state the soccer balls are to be inflated to 13 PSI (Pounds per Square Inch). Prior to each game, the referees check the three game balls. If
the game balls are inflated to 1 PSI more or less of the desired weight, they are
approved for use in the game. Which absolute value equation best represents the least
and the most that a MLS soccer ball weighs?
a. lx - 11 = 13
b. lx-131 = 1
c. 1x + 11 = 13
d. (x + 131 = 1

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.