A political candidate testing the effectiveness of a new advertisement takes a simple random sample of 300 voters before the ad goes on air and another sample of 250 voters afterwards. 158 of the 300 voters in the "before" sample say they support his candidacy, and 140 in the "after" sample say they support him. If pA = proportion approving his candidacy in the after sample and pB = proportion approving his candidacy in the before sample, which of the following is the correct test statistic for H0 : pA - pB = 0?

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