What is the Z* for a 98% confidence interval

06172007, 03:21 PM

#1

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

What is the Z* for a 98% confidence interval
doing some stat homework, and i need to know the Z* score given: a 98% confidence interval. I know 99% confidence is = 2.576 and 95% is 1.960 but i dont know 98% or how to find it. Can someone help out?



06172007, 03:23 PM

#2

most hood white kid
Join Date: Jul 2004
Location: Vegas...Formerly Tennessee
Posts: 9,537

Re: What is the Z* for a 98% confidence interval (SilentHill)
Quote:
Originally Posted by SilentHill
doing some stat homework, and i need to know the Z* score given: a 98% confidence interval. I know 99% confidence is = 2.576 and 95% is 1.960 but i dont know 98% or how to find it. Can someone help out?

is it not in the back of your book?
it was in the back of my book



06172007, 03:25 PM

#3

HondaTech Member
Join Date: Jan 2002
Location: Redondo Beach, CA, USA
Posts: 614

Re: What is the Z* for a 98% confidence interval (.BigSexy)
Quote:
Originally Posted by .BigSexy
is it not in the back of your book?
it was in the back of my book

Yeah they always have the charts in the back



06172007, 03:25 PM

#4

Junior Member
Join Date: Mar 2004
Location: Chicago, IL, USA
Posts: 825

Re: What is the Z* for a 98% confidence interval (SilentHill)
2.326?



06172007, 03:25 PM

#5

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

Re: What is the Z* for a 98% confidence interval (.BigSexy)
no i have a Z table but its just for Z scores not Z* for confidence intervals and i cant figure out how to calculate it on my own. Its obviously some thing like 1x blah blah math bullshit = the score i need but i dont remember what to do.



06172007, 03:27 PM

#6

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

Re: What is the Z* for a 98% confidence interval (Endless STi)
Quote:
Originally Posted by Endless STi
2.326?

im gonna try that number and see what i get, how did u get that number anyways??



06172007, 03:27 PM

#7

Junior Member
Join Date: Mar 2004
Location: Chicago, IL, USA
Posts: 825

Re: What is the Z* for a 98% confidence interval (SilentHill)
I just pulled through my old charts for Stats and it was there.



06172007, 03:28 PM

#8

most hood white kid
Join Date: Jul 2004
Location: Vegas...Formerly Tennessee
Posts: 9,537

Re: What is the Z* for a 98% confidence interval (SilentHill)
I used to know how to do it, but I took the class over a year ago and no longer have my book. Sorry I cant help



06172007, 03:36 PM

#9

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

Re: What is the Z* for a 98% confidence interval (.BigSexy)
thanks a million you were right the formula is
xbar + or  Z* times sigma divided by the square root of N
that Z* score worked
HondaTech GDD



06172007, 03:41 PM

#10

most hood white kid
Join Date: Jul 2004
Location: Vegas...Formerly Tennessee
Posts: 9,537

Re: What is the Z* for a 98% confidence interval (SilentHill)
Quote:
Originally Posted by SilentHill
thanks a million you were right the formula is
xbar + or  Z* times sigma divided by the square root of N
that Z* score worked
HondaTech GDD

xbar is the mean and sigma is the standard deviation right?



06172007, 03:45 PM

#11

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

Re: What is the Z* for a 98% confidence interval (.BigSexy)
Xbar is sample mean sigma is population standard deviation



06172007, 03:48 PM

#12

most hood white kid
Join Date: Jul 2004
Location: Vegas...Formerly Tennessee
Posts: 9,537

Re: What is the Z* for a 98% confidence interval (SilentHill)
Quote:
Originally Posted by SilentHill
Xbar is sample mean sigma is population standard deviation

I was close...like I said, its been over a year. Give me a book, and I can figure it out.
I am taking Quantitative Methods II this semester



06172007, 03:50 PM

#13

HondaTech Member
Join Date: Jul 2003
Posts: 2,439

Re: What is the Z* for a 98% confidence interval (SilentHill)



06172007, 04:19 PM

#14

HondaTech Member
Thread Starter
Join Date: Oct 2004
Posts: 268

Re: What is the Z* for a 98% confidence interval (.BigSexy)
Quote:
Originally Posted by .BigSexy
I was close...like I said, its been over a year. Give me a book, and I can figure it out.
I am taking Quantitative Methods II this semester

yeah i got screwed in college i really dont like math and im on my 4th math class in college. I took topics in contemporary finite math, Calculus, statistics, and now im in statistics for social sciences. Thats overkill for a political science major if you ask me but thats A&M for ya.



06172007, 04:26 PM

#15

Photoshop Guru
Join Date: May 2004
Location: Spartanburg, SC
Posts: 1,969

Re: What is the Z* for a 98% confidence interval (SilentHill)
I would help but I got a B in Prob and Stat and hated every minute of that class.
Good luck



06172007, 05:54 PM

#16

Eat me
Join Date: Jun 2003
Location: New Brunswick, NJ
Posts: 279

i thought this thread was about that dude z.1 or something like that, was a total douchbag... was he banned? havent seen posts from him



Tags

98, ci, confidence, figure, find, for, honda, interval, score, z, ztable 
Thread Tools 
Search this Thread 


Posting Rules

You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off



All times are GMT 8. The time now is 12:26 AM.
