### What is the margin of error for the given study

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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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