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First International Bedroom Poll Released

Posted: September 16, 2013

page 5 of 5

For the roughly 250 interviews conducted per country for the National Sleep Foundation's 2013 International Bedroom Poll, we can expect the values from our sample to be within about six percentage points of the true population value, 95% of the time. That means, if we get a value of 50% from our sample, we can be 95% sure that the population value is somewhere between 44% and 56%. This measure of the difference of the sample value from the true value, called the 'margin of error,' varies with the size of the sample and the results obtained.