According to the historical data, the life expectancy in the United Kingdom is less than the life expectancy in the United States. A new stuc see whether this has changed. Records of 235 individuals from the United Kingdom who died recently are selected at random. The 235 inc
of 78.1 years with a standard deviation of 6.6 years. Records of 270 individuals from the United States who died recently are selected at
independently. The 270 individuals lived a mean of 76.7 years with a standard deviation of 7.1 years. Assume that the population standar
lifetimes in these two countries can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90
for H1 - H2, the difference between the life expectancy , in the United Kingdom and the life expectancy P2 in the United States. Then fin
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. (If necessary,
formulas.)
Lower limit: 0
Upper limit: 1
Х
$
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