Math Is Fun Forum

markosheehan

Member

Registered: 2016-06-15

Posts: 51

statistics

A survey is being conducted of voters’ opinions on several different issues.
(i) What is the overall margin of error of the survey, at 95% confidence, if it is based on a
simple random sample of 1111 voters.
(B) A political party had claimed that it has the support of 23% of the electorate. Of the
voters in the sample above, 234 stated that they support the party. Is this sufficient
evidence to reject the party’s claim, at the 5% level of significance?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: statistics

Hi;

A) I thought the margin of error at 95% confidence is about equal to or smaller than the square root of the reciprocal of the sample size. The formula is

is this the same as the "overall margin of error?"

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
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markosheehan

Member

Registered: 2016-06-15

Posts: 51

Re: statistics

they use the formula 1/root n on my course where n stands for the size of the sample i all ready worked out the first bit but i cant work out the second part of the question

thickhead

Member

Registered: 2016-04-16

Posts: 1,086

Re: statistics

Last edited by thickhead (2016-09-03 17:41:19)

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{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}
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