A group of researchers want to determine if there are any significant differences in life expectancy...

A group of researchers want to determine if there are any significant differences in life expectancy between smokers and nonsmokers. They test this question with a sample of 62 nonsmokers, where the average life expectancy was 78 years (SS = 2200), and a sample of 50 smokers, where the average life expectancy was 68 years (SS = 2300). Use a confidence interval (where α = .01) for the appropriate statistical test to determine if there is a significant difference in life expectancy between smokers and nonsmokers. 8. Identify the alternative hypothesis 9. List your estimated standard error 10. List the t-value used to construct your confidence interval 11. List the lower bound of your confidence interval (where: nonsmokers – smokers) 12. List the upper bound of your confidence interval (where: nonsmokers – smokers) 13. Is the difference in life expectancy between smokers and nonsmokers statistically significant? (Yes/No) 14. Calculate Cohen’s d for the difference in life expectancy.

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orchestra answered 2 years ago

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