Reference no: EM13364324

Grindwell, Inc., a manufacturer of grinding tools, is con­cerned about the durability of its products, which depends

on the permeability of the sinter mixtures used in production. Suspecting that the carbon content might be the source of the problem, the plant manager collected the following data:

Carbon Content (%)	Permeability Index
5.5	16
3.0	31
4.5	21
4.8	19
4.2                                                                       16
4.7                                                                       23
5.1	20
4.4	11
3.6                                                                       20

 

a.  Draw a scatter diagram for these data.

b.  Is there a relationship between permeability and carbon content?

c.   If low permeability is desirable, what does the scatter diagram suggest with regard to the carbon content?

The operations manager for Superfast Airlines at Chicago's O'Hare Airport noticed an increase in the number of delayed flight departures. She brainstormed possible causes with her staff:

  Aircraft late to gate

  Acceptance of late passengers

  Passengers arriving late at gate

  Passenger processing delays at gate

  Late baggage to aircraft

  Other late personnel or unavailable items

  Mechanical failures

Draw a cause-and-effect diagram to organize the possible causes of delayed flight departures into the following maj categories: equipment, personnel, material, procedures, and "other factors" beyond managerial control. Provide a detailed set of causes for each major cause identified by operations manager, and incorporate them in your cause­and-effect diagram.