Question

A 20-minute consumer survey mailed to 500 adults aged 25­34 included a $5 Starbucks gift certificate. The same survey was mailed to 500 adults aged 25­34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. Form a 95 per- cent confidence interval for the difference of proportions. Does it include zero?


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  • CreatedAugust 19, 2015
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