King Tut was an ancient Egyptian ruler whose tomb was discovered and opened in 1923. Legend has it that the archaeologists who opened the tomb were subject to a "mummy's curse," which would shorten their life spans. The article "The Mummy's Curse: Historical Cohort Study" (M. Nelson, British Medical Journal, 2002:1482-1484) presents an investigation of the mummy's curse. The article reports that 25 people exposed to the curse had a mean life span of 70.0 years with a standard deviation of 12.4 years, while a sample of 11 Westerners in Egypt at the time who were not exposed to the curse had a mean life span of 75.0 years with a standard deviation of 13.6 years. Can you conclude that the mean life span of those exposed to the mummy's curse is less than the mean of those not exposed?