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April 12th, 2015, 04:03 AM  #1 
Newbie Joined: Apr 2015 From: Denmark Posts: 3 Thanks: 0  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 Galluppole, 1525 people are asked about their political opinions. The pole shows that "Redparty" has 48.2% of the votes whereas a previous Galluppole 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 pvalue 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 
April 12th, 2015, 06:32 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 21,134 Thanks: 2341 
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. 
April 12th, 2015, 11:11 AM  #3 
Newbie Joined: Apr 2015 From: Denmark Posts: 3 Thanks: 0 
Hi skipjack, I read the article, used the pooledvariance 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 
April 12th, 2015, 12:31 PM  #4 
Newbie Joined: Apr 2015 From: Denmark Posts: 3 Thanks: 0 
Problem solved. Thank you for posting the link skipjack. 

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