A group of business administration students conducted a survey on their university campus to find out the student demand for a product, a protein supplement for fruit smoothies. One of the first steps was to extract a random sample of 168 students and obtain data that could be useful to develop their marketing strategy. If 138 students decide to drink smoothies in the afternoon. Find the margin of error for the 90% confidence interval for the proportion of students who drink smoothies in the afternoon.
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