Mummy's curse: 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. A team of scientists conducted an investigation of the mummy's curse. They reported that the 27 people exposed to the curse had a mean life span of 71.3 years with a standard deviation of 12.1 years, while a sample of 13 Westerners in Egypt at the time who were not exposed to the curse had a mean life span of 78.5 years with a standard deviation of 14.5 years. Assume that the populations are approximately normal. Can you conclude that the mean life span of those exposed to the mummy's curse is less than the mean life span of those not exposed? Let , denote the mean life span of those exposed to the mummy's curse and denote the mean life span of those not exposed. Use the a=0.10 level and the P-value method with the TI-84 Plus calculator. B B