Chapter 4 · Sampling · Slide 144/274
What Is the Margin of Error?
"Which sources do you prefer to get your information from?"
4.4 · Sample Size
How Accurate Is This Number?
What Is the Margin of Error?
"Which sources do you prefer to get your information from?"
32 %
name social media as their main information channel
Sample
48.804
Respondents
Margin of error =
48.804 respondents in the sample
√48.804 = 220,916 ≈ 221
1 / 221 = 0.0045
· 100 = 0.45%
⇒ x = 32% ± 0.45%
⇒ from 31.55% to 32.45%
Calculations show approximate values for a 95% confidence level
QUESTIONSTAR · Dr. Paul Marx
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