Need to know if my answer are correct or no ?  TOPIC_SOLVED

Standard deviation, mean, variance, z-scores, t-tests, etc.

Re: Need to know if my answer are correct or no ?

Postby Martingale on Thu Jul 01, 2010 2:45 am

zorro wrote:
Martingale wrote:
zorro wrote:so

P(A) + P(B) - P(A B) = P(A). P(B)

0.5 + P(B) - 0.8 = 0.5 P(B)

P(B) - 0.3 = 0.5 P(B)

P(B) = 0.5/0.3 (Is this correct?)


How can P(B) = 0.5/0.3? That number is greater than 1!!



from my work can u please point out the mistake


start from here...
P(B) - 0.3 = 0.5 P(B)

and solve for P(B) again.
User avatar
Martingale
 
Posts: 350
Joined: Mon Mar 30, 2009 1:30 pm
Location: USA

Sponsor

Sponsor
 

Re: Need to know if my answer are correct or no ?

Postby zorro on Fri Jul 02, 2010 2:24 am

Martingale wrote:
start from here...
P(B) - 0.3 = 0.5 P(B)

and solve for P(B) again.




P(B) - 0.3 = 0.5 P(B)

P(B) - 0.5 P(B) = 0.3

P(B) [ 1 - 0.5 ] = 0.3

P(B) 0.5 = 0.3

P(B) = 0.3 / 0.5 (Is this correct ?)
User avatar
zorro
 
Posts: 28
Joined: Sat Jun 12, 2010 9:26 am

Re: Need to know if my answer are correct or no ?  TOPIC_SOLVED

Postby Martingale on Fri Jul 02, 2010 2:55 am

zorro wrote:
Martingale wrote:
start from here...
P(B) - 0.3 = 0.5 P(B)

and solve for P(B) again.




P(B) - 0.3 = 0.5 P(B)

P(B) - 0.5 P(B) = 0.3

P(B) [ 1 - 0.5 ] = 0.3

P(B) 0.5 = 0.3

P(B) = 0.3 / 0.5 (Is this correct ?)


Yes
User avatar
Martingale
 
Posts: 350
Joined: Mon Mar 30, 2009 1:30 pm
Location: USA

Previous

Return to Statistics