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Fix typo in welchttest.md

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docs/en/sql-reference/aggregate-functions/reference/welchttest.md
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@ -27,7 +27,7 @@ The null hypothesis is that means of populations are equal. Normal distribution
**Returned values**
[Tuple](../../../sql-reference/data-types/tuple.md) with two two or four elements (if the optional `confidence_level` is specified)
[Tuple](../../../sql-reference/data-types/tuple.md) with two or four elements (if the optional `confidence_level` is specified)
- calculated t-statistic. [Float64](../../../sql-reference/data-types/float.md).
- calculated p-value. [Float64](../../../sql-reference/data-types/float.md).