7. A national pharmacy chain is experimenting with a new inventory system. At the end of each month the chain's thousands of stores must get rid of outdated inventory (i.e. inventory past the expiration date). If this number can be reduced, the chain will save money. The table below contains the amount of outdated inventory for 9 randomly selected stores in the chain at the end of the months of October (before implementation of the new inventory system) and November (after implementation of the new inventory system). Construct a 90% confidence interval for the difference in the amount of outdated inventory after implementation of the new system. Interpret your interval (i.e. what, exactly, does it mean in this case). Be specific. Round to 4 (FOUR) decimal places. Store Number October, 2018 (Before) November, 2018 (After) $11,345 $10,985 N $8.562 $7,475 W $1,400 $1,469 $13,273 $11,006 $10,567 $9,326 $951 $1,215 $7,269 $6,450 CO $8,513 $7,399 LO $4,522 $3,917