According to the historical data, the life expectancy in France is less than the life expectancy in Germany. A new study has been made to see whether this has changed. Records of 240 individuals from France who died recently are selected at random. The 240 individuals lived a mean of 78.1 years with a standard deviation of 6.6

years. Records of 295 individuals from Germany who died recently are selected at random and independently. The 295 individuals lived a mean of 77.1

years with a standard deviation of 5.5 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 ?1 - ?2, the difference between the life expectancy ?1 in France and the life expectancy ?2 in Germany. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places

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