Could really understand the question  TOPIC_SOLVED

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

Could really understand the question

Postby zorro on Fri Jul 02, 2010 2:29 am

Question :

A random sample of 500 components was taken from a large consignment and 60 were found to be defective . Obtain the 98% confidence limits for the percentage of defective components in the consignment
(Note that significant value of Z at 2% level of significance is 2.33)

please just point me to the right direction
User avatar
zorro
 
Posts: 28
Joined: Sat Jun 12, 2010 9:26 am

Sponsor

Sponsor
 

Re: Could really understand the question

Postby Martingale on Fri Jul 02, 2010 2:58 am

zorro wrote:Question :

A random sample of 500 components was taken from a large consignment and 60 were found to be defective . Obtain the 98% confidence limits for the percentage of defective components in the consignment
(Note that significant value of Z at 2% level of significance is 2.33)

please just point me to the right direction


Where are you stuck?
User avatar
Martingale
 
Posts: 350
Joined: Mon Mar 30, 2009 1:30 pm
Location: USA

Re: Could really understand the question

Postby zorro on Sat Jul 03, 2010 6:10 am

How do i know what is the standard deviation in this problem

from the question i can figure out that

n = 500
= 60
User avatar
zorro
 
Posts: 28
Joined: Sat Jun 12, 2010 9:26 am

Re: Could really understand the question

Postby Martingale on Sat Jul 03, 2010 2:34 pm

zorro wrote:How do i know what is the standard deviation in this problem

from the question i can figure out that

n = 500
= 60


you need to use



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

Re: Could really understand the question

Postby zorro on Sat Jul 03, 2010 6:36 pm

Martingale wrote:you need to use



Where


Could u please tell what is the name of the formula ?? :confused:
User avatar
zorro
 
Posts: 28
Joined: Sat Jun 12, 2010 9:26 am

Re: Could really understand the question  TOPIC_SOLVED

Postby Martingale on Sat Jul 03, 2010 8:08 pm

zorro wrote:Could u please tell what is the name of the formula ?? :confused:


It's the confidence interval for population proportions (assuming normality)
User avatar
Martingale
 
Posts: 350
Joined: Mon Mar 30, 2009 1:30 pm
Location: USA

Re: Could really understand the question

Postby zorro on Sun Jul 04, 2010 5:40 am

Thanks All :mrgreen: :clap:
User avatar
zorro
 
Posts: 28
Joined: Sat Jun 12, 2010 9:26 am


Return to Statistics

cron