In comparing the actions of 180 different students before and after a "Let's clean up our garbage" poster campaign,Paloutzian found that ___________ more passers-by picked up test litter after the campaign than had done so before the campaign.

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The Answer of In comparing the actions of 180 different students before and after a "Let's clean up our garbage" poster campaign,Paloutzian found that ___________ more passers-by picked up test litter after the campaign than had done so before the campaign.

In Comparing the Actions of 180 Different Students Before and After