Sales of a New Line of Athletic Footwear Are Crucial

Multiple Choice

Sales of a new line of athletic footwear are crucial to the success of a company. The company wishes to estimate the average weekly sales of the new footwear to within $500 with 90% reliability. The initial sales indicate that the standard deviation of the weekly sales figures is approximately $1200. How many weeks of data must be sampled for the company to get the information it desires?

A) 16 weeks
B) 4 weeks
C) 10 weeks
D) 7794 weeks