发布日期 ： 2021-01-28 01:34:21 UTC
分类 ： Electronic
Suppose the two populations X and Y are independent of each other and obey the normal distribution. The mean and variance of X areμ<sub>1</sub>,σ<sub>1</sub><sup>2</sup>, The mean and variance of Y areμ<sub>2</sub>,σ<sub>2</sub><sup>2</sup>, that is X~N(μ<sub>1</sub>,σ<sub>1</sub><sup>2</sup>), Y~N(μ<sub>2</sub>,σ<sub>2</sub><sup>2</sup>),This page is σ<sub>1</sub><sup>2</sup>,σ<sub>2</sub><sup>2</sup>which are same but unknown mean differenceμ<sub>1</sub>-μ<sub>2</sub>make hypothesis test，the statistics are
<img align="middle" alt="" src="http://drr.ikcest.org/static/upload/03/03dbf6c6-ecb8-11e9-b84a-00163e0618d6_m.jpg" style="width: 150px;" > ， among them <img align="middle" alt="" src="http://drr.ikcest.org/static/upload/0f/0fd6a304-ecb8-11e9-b84a-00163e0618d6_m.jpg" style="width: 230px;" >
,n<sub>1</sub>,<span style="text-decoration: overline">X</span>,S<sub>1</sub> are the sample size, sample mean, and sample standard deviation of the population X. n<sub>2</sub>,<span style="text-decoration: overline">Y</span>,S<sub>2</sub>are the sample size, sample mean, and sample standard deviation of the overall Y.