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Hi John, The first interpretation would be better, as you are talking about being "confident". In your second interpretation, you are saying that if you conduct the experiment 100 times, "95%" of the time the true parameter will lie within the range - in general, that is not true! However, if you conduct the experiment "many times" then you would expect that approximately "95%" of the time your parameter will lie within the range. Hope that helps. Dr. Ali Sheikhi Department of Mathematics and Statistics, University of Limerick, Limerick, IRELAND On Fri, Oct 30, 2015 at 12:29 PM, John Sorkin <[log in to unmask]> wrote: > I would appreciate thoughts about the following two descriptions of a 95% > CI: > Call > Send SMS > Call from mobile > Add to Skype > You'll need Skype CreditFree via Skype > > For a given parameter X, a 95% CI round X is: > 1) A range of values which we can say with 95% confidence contains the > true value of the parameter. > 2) A range of values constructed such that if an experiment is conducted > 100 times, 95% of the time X will lie with the range. > > I would welcome comments of the above descriptions, and any better > descriptions that you might have. > > Thank you, > John > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > *Confidentiality Statement:* > > This email message, including any attachments, is for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. Any unauthorized use, disclosure or distribution is > prohibited. If you are not the intended recipient, please contact the > sender by reply email and destroy all copies of the original message. > You may leave the list at any time by sending the command > > SIGNOFF allstat > > to [log in to unmask], leaving the subject line blank. > You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.