Essay
An undergraduate business student studies diligently in the library during dead week in anticipation of an outstanding performance on her final exams. She asks a friend to spy on her at random intervals to determine what percentage of time she is actually studying. Over the course of three days, her friend records the following observations:
If the student wants a 95 percent confidence level (z = 1.96) and a degree of precision of + 0.08, how many more observations are needed?
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