Confidence interval for difference in life expectancy
Not what you're looking for?
According to the historical data, the life expectancy in the United Kingdom is less than the life expectancy in the United States. A new study has been made to see whether this has changed. Records of 230 individuals from the United Kingdom who died recently are selected at random. The 230 individuals lived a mean of 78.2 years with a standard deviation of 6.7 years. Records of 255 individuals from the United States who died recently are selected at random and independently. The 255 individuals lived a mean of 76.6 years with a standard deviation of 7.1 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 95% confidence interval for M1-M2, the difference between the life expectancy M1 in the United Kingdom and the life expectancy M2 in the United States. Then complete the table below.
1. What is the lower limit of 95% confidence interval?
2. What is the upper limit of 95% confidence interval?
Purchase this Solution
Solution Summary
Solution describes the steps for determining confidence interval for M1-M2 (the difference between the life expectancy M1 in the United Kingdom and the life expectancy M2 in the United States)
Solution Preview
Please refer attached file for complete solution. Expression typed with the help of equation writer are missing here.
Solution:
Sample mean life expectancy in UK= =78.2 years
Sample Standard deviation of life expectancy in UK=s1=6.7 years
Sample size of UK=n1= 230
Sample mean life expectancy in US= =76.6 years
Sample Standard deviation of life ...
Education
- BEng (Hons) , Birla Institute of Technology and Science, India
- MSc (Hons) , Birla Institute of Technology and Science, India
Recent Feedback
- "Thank you"
- "Really great step by step solution"
- "I had tried another service before Brain Mass and they pale in comparison. This was perfect."
- "Thanks Again! This is totally a great service!"
- "Thank you so much for your help!"
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.