In a random sample of 500 people aged were smokers. In a random sample of 450 people aged 25-29, 14\% were smokers. A confidence interval for the difference between the proportion of 20-24 year olds and the proportion of 25-29 year olds who are smokers is
Which of the following statements give a correct interpretation of this confidence interval?
I. We can be confident that the interval to contains the true difference between the two population proportions.
II. There is a chance that the true difference between the two population proportions lies between and .
III. If the process were repeated many times, each time selecting random samples of 500 people aged 20-24 and 450 people aged 25-29 and each time constructing a confidence interval for of the time the true difference between the two population proportions will lie between and .
IV. If the process were repeated many times, each time selecting random samples of 500 people aged 20-24 and 450 people aged 25-29 and each time constructing a confidence interval for of the time the confidence interval limits will contain the true difference between the two population proportions.
A) I and IV
B) II and IV
C) I and III
D) II and III
Correct Answer:
Verified
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