According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 individuals from argentina who died recently are selected at random. The 225 individuals lived an average of 77.4 years with a standard deviation of 6.7 years. Records of 300 individuals from Ireland who died recently are selected at random and independently. The 300 individuals lived a mean of 76.5 years with a standard deviation of 5.3 years. Assume that the population standard deviations of lifetimes in these two countries can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90% confidence interval for , the difference between the life expectancy in the United States and the life expectancy in Ireland. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 individuals from argentina who died recently are selected at random. The 225 individuals lived an average of 77.4 years with a standard deviation of 6.7 years. Records of 300 individuals from Ireland who died recently are selected at random and independently. The 300 individuals lived a mean of 76.5 years with a standard deviation of 5.3 years. Assume that the population standard deviations of lifetimes in these two countries can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90% confidence interval for , the difference between the life expectancy in the United States and the life expectancy in Ireland. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.
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