Provided that the sample sizes m and n of two independent samples X and Y are both large , then a confidence interval for the difference between the two population means, $\mu _ { 1 } - \mu _ { 2 } ,$ with a confidence level of approximately $100 ( 1 - \alpha ) \%$ is __________, where the values of the population variances are unknown.

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The Answer of Provided that the sample sizes m and n of two independent samples X and Y are both large , then a confidence interval for the difference between the two population means, $\mu _ { 1 } - \mu _ { 2 } ,$ with a confidence level of approximately $100 ( 1 - \alpha ) \%$ is __________, where the values of the population variances are unknown.

Provided That the Sample Sizes M and N of Two μ1−μ2,\mu _ { 1 } - \mu _ { 2 } ,μ1​−μ2​,

Provided That the Sample Sizes M and N of Two $\mu _ { 1 } - \mu _ { 2 } ,$