For the ‘Change’ column (E) in Figure G.5:

a) Determine the upper and lower limits for a 3-standarddeviation accuracy check.

b) Which, if any, values fall outside the limits computed in part (a)?

A B C 1 Thompson Industries Monthly Supplier Report - April 2 3 SupplierName 4 Maverick Supplies 5 Cowboy Pete's Lumber 6 ABC Metals 7 Perkins Plastics 8 Everything Brass 9 Jones Aluminum & Copper 10 Rick's Wrought Iron 11 Penelope's Paper Products 12 Anthony's Adhesives 13 Columbus Manufacturing 14 Smart Electronics, Inc. 15 Watson Woodworking 16 Fred's Foam Molding 17 Impenetrable Insulation, Inc. 18 Suzy's Shipping Supplies Sup No 6071 6894 5054 5528 4413 5858 9733 4718 9944 1343 4785 2730 2949 1443 8039 SupCat P P S P P P S P P S P S S P P D Purchases $39,117 $25,554 $13,051 $27,886 $29,300 $16,862 $29,078 $25,716 $22,750 $20,103 $30,062 $32,589 $47,886 $24,971 $23,851 E Change $5,000 $400 $13,051 $3,256 ($4,658) $16,862 ($3,121) $8,795 $1,268 $469 $30,062 $471 $47,886 ($6,895) $1,269 F Quality 5 5 3 4 5 4 1 3 4 4 2 5 5 4 5 G On-Time 100% 90% 0% 100% 100% 50% 60% 100% 90% 100% 33% 25% 100% 15% 50% H Returns 0% 0% 75% 3% 0% 5% 80% 12% 4% 0% 50% 1% 0.50% 4% 0% RejShip 0 0 2 0 0 1 6 0 0 0 0 0 0 0 0 New Sup N N Y N N Y N N N N Y N Y N N