In a survey conducted with 600 participants across the United States, 450 were found to have studied science in college. If we were to predict the population proportion with a 99.7% confidence, what would the confidence interval be? 69.7% to 80.3% 73.23% to 76.76% 71.46% to 78.53% 73.5% to 76.5%

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In a survey conducted with 600 participants across the United States, 450 were found to have studied science in college. If we were to predict the population proportion with a 99.7% confidence, what would the confidence interval be? 69.7% to 80.3% 73.23% to 76.76% 71.46% to 78.53% 73.5% to 76.5%

Mathematics
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I have the steps to this problem but I went wrong somewhere so I don't understand it
okay, so first 450/600 = ?
0.75

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okay now for a 99.7 %, u have to find the Z score for that
the next step is to find out what the standard deviation of thing should be
ohhh see, that was the step I was missing, the standard deviation. Except idk how to do it
oh um also we know the center is definately 0.75 right
yes..
or 75%, some of the choices u are given arent centered around that, so they can eliminated rightway
would it be D?
nvm, all them are centered around 75% cant elimnate any argh
oh okay so what do I do now
C is definitely wrong 71.46% to 78.53% as it should say 71.46% to 78.54%
Well I wrote all the answers correctly so idk, I just checked
its probably just bad rounding
So it's definitely not C?
What is the Z score u foundÉ
the formula for z score is \[z= \frac{ X-\mu }{ \sigma }\] right...
yes thats another one,. but we cant use that right now
oh... then what do we use
i just mean we have to find Z score, for the 99.7 %
you have to look at that table and chart
okay how do I do that
http://www.statisticshowto.com/tables/t-distribution-table/ this one right
cause this is where I was stuck, I wasn't sure what numbers or whatever to look at on the chart
click on the 2 tail one
https://www.youtube.com/watch?v=_x6j-rH33Og you can watch this, i know it says typically not used for sample size greater than 30.. but the standard deviation is unknown so, what else can we do
wait is it B?
no clue it looks like info is missing, what can we do with sample deviation is unknown and the pop deviation is unknown @hartnn
here is the entire question
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ya hm not sure
ok I just need help cause I need to answer it soon
@ganeshie8 is the question missing info??
so do you know anything..
I am eating at the moment but I found this https://answers.yahoo.com/question/index?qid=20140522184044AAlIk3W
I'm on my school computer so yahoo is blocked, could you tell me what it says
how about this http://gyazo.com/d103059ce0cd9eadfd631e125a3f3bc9
no it's still blocked..
try this
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thanks so much :)
np

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