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.