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double matrix mutually exclusive option selection problem

Expert replies
by viny » Fri Aug 09, 2013 4:29 am
I am finding it very difficult to choose what is to be the rows and the columns headings in double matrix method.
In the manhattan gmat guide i found a ques which talks about 2 problems in an exam being right or wrong and they have chosen the columms to be problem 1 right ,problem 1 wrong and rows to be problem 2 right and problem 2 wrong.
however in the next question which deals with men and women guests in a annual party of company x are either the employees of company X or not the employees of company X they have made the colums to be men ,women and rows as employee and non employee.
my question is according to the first type the second men and women question should be rows men employd,men not employee..and columns women employee and women not employee
also what is the meaning of mutual exclusive and how do I make out in any problem what column headings do i select.
thankyou
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Source: — Problem Solving |

by Brent@GMATPrepNow » Fri Aug 09, 2013 6:28 am
viny wrote:I am finding it very difficult to choose what is to be the rows and the columns headings in double matrix method.
In the manhattan gmat guide i found a ques which talks about 2 problems in an exam being right or wrong and they have chosen the columms to be problem 1 right ,problem 1 wrong and rows to be problem 2 right and problem 2 wrong.
however in the next question which deals with men and women guests in a annual party of company x are either the employees of company X or not the employees of company X they have made the colums to be men ,women and rows as employee and non employee.
my question is according to the first type the second men and women question should be rows men employd,men not employee..and columns women employee and women not employee
also what is the meaning of mutual exclusive and how do I make out in any problem what column headings do i select.
thankyou
Hi Viny,

You must label the rows and columns in accordance to the two individual characteristics that define the population. Then, the 4 inside boxes will successfully categorize each member of that population.

So, labeling the rows "employees" and "not employees," and labeling the column "men" and "women" will take care of every possible type of person. For example, the box that lines up with "women" and "not employee" represents a woman who is not an employee of the company.

In yous suggestion, you suggest that we label the rows "men employee" and "men not employee" and then label the columns "women employee" and "women not employee," what do we say about the box that lines up with "women employee" and "men not employee." What kind of person has both of these characteristics?

To learn more about the Double Matrix method, please watch our free video: https://www.gmatprepnow.com/module/gmat- ... ems?id=919

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by melguy » Fri Aug 09, 2013 7:00 am
Hi Viny

Brent has already responded so I cant advice any better than him but just to give you a graphical idea of the matrix. If you look at this table it will cover all the possibilities.

Hope it helps.
Attachments
matrix.jpg
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