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In a recent satisfaction survey of 400 customers at XYC inc., it is found that proportion of customers who are completely satisfied is 0.28. Test

In a recent satisfaction survey of 400 customers at XYC inc., it is found that proportion of customers who are completely satisfied is 0.28. Test the hypothesis that the proportion of customers who are completely satisfied is different from 0.26 at 0.05 level of significance

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