A Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15...
A Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15 and older suggests that 30% smoke regularly or occasionally. The following is also noted "one can say with 95% confidence that the maximum margin of sampling error is 2.2 percentage points". Which of the following is true based on the results of this survey?
- ____We are 95% confident that 25.6% to 34.4% of all Chinese
adults smoke.
____If we were to randomly sample another group of 4,220 Chinese adults we would find that exactly 30% of them smoke as well.
-
____We are 95% confident that 27.8 % to 32.2 % of all Chinese adults smoke.
-
____Exactly 30% of all Chinese adults smoke.
-
____If the sample size was larger, the margin of error would be larger as well.
Homework Answers
Lower Limit = 30-2.2 = 27.8
Upper Limit = 30+2.2 = 32.2
Ans : We are 95% confident that 27.8 % to 32.2 % of all Chinese adults smoke.
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