Estimation of a mean, variance, difference between two means and the ratio of two variances based on a sample; tests for comparing a mean or variance with a given value, or the difference between two means or between two variances. Procedures for means given for known and unknown variance. Guidance on testing. Normality assumption.Cross References:BS 600BS 1313BS 2564BS 2846:Part 2BS 2846:Part 3BS 2846:Part 6BS 6000BS 6001BS 6002ISO/DIS 3725