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

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

Provided That at Least One of the Sample Sizes M μ1−μ2,\mu _ { 1 } - \mu _ { 2} ,μ1​−μ2​,

Provided That at Least One of the Sample Sizes M $\mu _ { 1 } - \mu _ { 2} ,$