Considering the drawbacks of current algorithms of content-oriented music-info false retrieval,and the characteristics of recursion,a recursion-based algorithm in music-info false-retrieval aiming at content,and a corresponding R-tree based scheme of music-info index had been designed in this paper.

This paper describes the use of statistics in the comparative tests on the ability for testing GRP mechanical properties and cites 3 examples to give positive or negative judgement on the agreement of test results by t-test.

Dead-stop titration method and the new one were compared by t-test.

T-test shows that there is statistical significance in the post-test of the two groups while not in their pre-test,which proves that text back-translation is a useful means of fossilization correction in SLA.

A t-test method was adopted to evaluate the similarity of chromatographic fingerprint of herbal medicine.

Based on the test of total stability of bench mark with mean tolerance method,the unstable points are picked up with t-test method instead of old method and achieved high efficience.

t test excelling grubbs test;

Given σ,the population standard deviation, is unknown, the sequence for the five tests arranged in priority order goes like t test, Grubbs test, peakness test, Dixion test, skewness test.