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April 12th, 2015, 04:03 AM   #1
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Question Hypothesis testing

Hi all,

I'm currently doing some hypothesis testing assignments (not mandatory, just for fun ), and there's one I'm having quite some issues with.

In a Gallup-pole, 1525 people are asked about their political opinions.
The pole shows that "Red-party" has 48.2% of the votes whereas a previous Gallup-pole showed only 45%.

I'm asked whether or not this is a significant increase in their votes (significance level = 0.05).

I'm not exactly sure about where to start. Can anyone give me a hint?

I'm thinking that a simple solution for me would just be to find the p-value and compare this to the significance level. But how do I do that?

Last edited by kstudent; April 12th, 2015 at 04:14 AM. Reason: Adding information
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April 12th, 2015, 06:32 AM   #2
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You can reasonably assume that the previous poll mentioned used a sample of about the same (about 1525 people).

Please read this article, then ask again here if you need further help.
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April 12th, 2015, 11:11 AM   #3
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Hi skipjack,

I read the article, used the pooled-variance estimator and got a result.
But is it the right result? I get that there actually was a significant increase in the proportion of voters. I've put up my answer here as an image - it's in danish though, but hopefully you'll understand the math

http://tinypic.com/r/nb289/8

/K
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April 12th, 2015, 12:31 PM   #4
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Problem solved.
Thank you for posting the link skipjack.
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