anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
I have the steps to this problem but I went wrong somewhere so I don't understand it
dan815
  • dan815
okay, so first 450/600 = ?
anonymous
  • anonymous
0.75

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More answers

dan815
  • dan815
okay now for a 99.7 %, u have to find the Z score for that
dan815
  • dan815
the next step is to find out what the standard deviation of thing should be
anonymous
  • anonymous
ohhh see, that was the step I was missing, the standard deviation. Except idk how to do it
dan815
  • dan815
oh um also we know the center is definately 0.75 right
anonymous
  • anonymous
yes..
dan815
  • dan815
or 75%, some of the choices u are given arent centered around that, so they can eliminated rightway
anonymous
  • anonymous
would it be D?
dan815
  • dan815
nvm, all them are centered around 75% cant elimnate any argh
anonymous
  • anonymous
oh okay so what do I do now
dan815
  • dan815
C is definitely wrong 71.46% to 78.53% as it should say 71.46% to 78.54%
anonymous
  • anonymous
Well I wrote all the answers correctly so idk, I just checked
dan815
  • dan815
its probably just bad rounding
anonymous
  • anonymous
So it's definitely not C?
dan815
  • dan815
What is the Z score u foundÉ
anonymous
  • anonymous
the formula for z score is \[z= \frac{ X-\mu }{ \sigma }\] right...
dan815
  • dan815
yes thats another one,. but we cant use that right now
anonymous
  • anonymous
oh... then what do we use
dan815
  • dan815
i just mean we have to find Z score, for the 99.7 %
dan815
  • dan815
you have to look at that table and chart
anonymous
  • anonymous
okay how do I do that
anonymous
  • anonymous
http://www.statisticshowto.com/tables/t-distribution-table/ this one right
anonymous
  • anonymous
cause this is where I was stuck, I wasn't sure what numbers or whatever to look at on the chart
dan815
  • dan815
click on the 2 tail one
dan815
  • dan815
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
anonymous
  • anonymous
wait is it B?
dan815
  • dan815
no clue it looks like info is missing, what can we do with sample deviation is unknown and the pop deviation is unknown @hartnn
anonymous
  • anonymous
here is the entire question
1 Attachment
dan815
  • dan815
ya hm not sure
anonymous
  • anonymous
ok I just need help cause I need to answer it soon
dan815
  • dan815
@ganeshie8 is the question missing info??
anonymous
  • anonymous
so do you know anything..
anonymous
  • anonymous
@ParthKohli
ganeshie8
  • ganeshie8
I am eating at the moment but I found this https://answers.yahoo.com/question/index?qid=20140522184044AAlIk3W
anonymous
  • anonymous
I'm on my school computer so yahoo is blocked, could you tell me what it says
ganeshie8
  • ganeshie8
how about this http://gyazo.com/d103059ce0cd9eadfd631e125a3f3bc9
anonymous
  • anonymous
no it's still blocked..
ganeshie8
  • ganeshie8
try this
1 Attachment
anonymous
  • anonymous
thanks so much :)
ganeshie8
  • ganeshie8
np

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