Question

4b. If a random sample of 50 non-smokers has a mean life of 66 years with a standard deviation of 8 years and a random sample of 65 smokers live on the average 58 years with standard deviation of 9 years, find 95% confidence interval for the difference of mean life of non-smokers and smoke

Answer 1

Answer:

5 years

Step-by-step explanation:

5 years may be is correct answer