Question: t = ( M 1 - M 2 )/( s 2 M1 + s 2 M2 ) = -3/1.66 = -2.33 Hello, In this equation

t= (M₁-M₂)/(s²_M1+s²_M2) = -3/1.66 = -2.33

Hello, In this equation I am trying to understand why and how the portion in the denominator is using this version of the estimated standard error for calculating the t-statistic and how they got the answer of 1.66 instead of using the known formula for calculating the estimated standard error using the pooled variance?

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