##Statistics Seminar##\\ Department of Mathematical Sciences ~~META:title =February 12, 2015~~ ^ **DATE:**|Thursday, February 12, 2015 | ^ **TIME:**|1:15pm to 2:15pm | ^ **LOCATION:**|WH 100E | ^ **SPEAKER:**|Zhihan Lin (Binghamton University) | ^ **TITLE:**|Proof of the non-existence of a fixed-sample-size fixed-width confidence interval for the unknown mean of a normal distribution with unknown variance | \\ **Abstract** We will show that there exists no fixed-sample-size fixed-width confidence interval for the unknown mean of a normal distribution when the variance is unknown.