What is the Z* for a 98% confidence interval

06172007, 03:21 PM

#1

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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
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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

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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

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



06172007, 03:25 PM

#5

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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

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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

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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
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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

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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
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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

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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
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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

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



06172007, 04:19 PM

#14

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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

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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
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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



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