A local coffee shop wants to implement a new promotional campaign. To measure success of the campaign, the sales of 10 products are measured before the campaign and after, and the difference is taken (after – before), with an average difference of 1.2 units sold and a standard deviation of 2.36. At the 5% level of significance, can we conclude the promotional campaign was effective? That is, were sales higher after the promotion? Perform all the steps of a hypothesis test. show all steps

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