Fortune magazine (March 1997) reported the total returns
Chapter , Problem 5.35(choose chapter or problem)
Fortune magazine (March 1997) reported the total returns to investors for the 10 years prior to 1996 and also for 1996 for 431 companies. The total returns for 9 of the companies and the S&P 500 are listed below. Find a 95% confidence interval for the mean change in percent return to investors. Total Return to Investors Company 198696 1996 Coca-Cola 29.8% 43.3% Mirage Resorts 27.9% 25.4% Merck 22.1% 24.0% Microsoft 44.5% 88.3% Johnson & Johnson 22.2% 18.1% Intel 43.8% 131.2% Pfizer 21.7% 34.0% Procter & Gamble 21.9% 32.1% Berkshire Hathaway 28.3% 6.2% S&P 500 11.8% 20.3%
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