What is the margin of error for this study use 95, Finance Basics

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What is the margin of error for this study use 95

The motion picture Harry Potter and the Sorcerer's shattered the box office debut record previously held by the Lost World: Jurassic Park (the Wall Street Journal, November 19, 2001). A sample of 100 movie theaters showed that the mean three-day weekend gross was $25,467 per
theater and the standard deviation was $4980.

a- What is the margin of error for this study? Use 95% confidence.

b- What is the 95% confidence interval estimate for the population mean weekend gross per theater?

c- The Last World took in $ 72.1 million in its first three day weekend.

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