You read your course textbook.
-----Original Message-----
From: A UK-based worldwide e-mail broadcast system mailing list [mailto:[log in to unmask]]On Behalf Of K Lau
Sent: 19 September 2008 15:44
To: [log in to unmask]
Subject: confidence interval for sample size
Dear all,
In a market research study, how do I decide the sample size if a probability sample aiming for a +/-3% confidence interval at a 95% confidence level is required?
Many thanks.
K LAU
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