Question

An analytical method for determining residual nickel content in shortening was tested against a standard containing exactly 1.626% Ni. The results obtained for percent residual Ni were as follows: 1.608, 1.626, 1.626, 1.629, 1.630, 1.606.
Has a significant error been demonstrated at the 95% confidence interval? Answer should be either yes or no

Answer 1

http://www.stat.yale.edu/Courses/1997-98/101/confint.htm
Scroll down about 1/2 the page.