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In a Random Sample of 500 People Aged 2024,22%20 - 24,22 \%

Question 112

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In a random sample of 500 people aged 2024,22%20 - 24,22 \% were smokers. In a random sample of 450 people aged 25-29, 14\% were smokers. A 95%95 \% 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 0.032<p1p2<0.1280.032 < \mathrm { p } _ { 1 } - \mathrm { p } _ { 2 } < 0.128
Which of the following statements give a correct interpretation of this confidence interval?
I. We can be 95%95 \% confident that the interval 0.0320.032 to 0.1280.128 contains the true difference between the two population proportions.
II. There is a 95%95 \% chance that the true difference between the two population proportions lies between 0.0320.032 and 0.1280.128 .
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 p1\mathrm { p } _ { 1 } p2,95%p _ { 2 } , 95 \% of the time the true difference between the two population proportions will lie between 0.0320.032 and 0.1280.128 .
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 p1p _ { 1 } - p2,95%\mathrm { p } _ { 2 } , 95 \% 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

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