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An engineering student randomly sampled the train arrival times at a nearby train station. Based on the results, the student estimates that 
92% of the trains arrived within 2 minutes of their scheduled arrival times. The margin of error for this estimation is 
3%. Which of the following is the most appropriate conclusion about all train arrival times at the station, based on the given estimate and margin of error?
Choose 1 answer:
(A) It is plausible that 
89% and 
95% of all trains arrive within 2 minutes of their scheduled arrival times.
(B) Exactly 
92% of all trains arrive within 5 minutes of their scheduled arrival times.
(C) The student is 
3% sure that most trains arrive within 2 minutes of their scheduled arrival times.
D The student is 
97% sure that exactly 
92% of all trains arrive within 2 minutes of their scheduled arrival times.

An engineering student randomly sampled the train arrival times at a nearby train station. Based on the results, the student estimates that 92% 92 \% of the trains arrived within 22 minutes of their scheduled arrival times. The margin of error for this estimation is 3% 3 \% . Which of the following is the most appropriate conclusion about all train arrival times at the station, based on the given estimate and margin of error?\newlineChoose 11 answer:\newline(A) It is plausible that 89% 89 \% and 95% 95 \% of all trains arrive within 22 minutes of their scheduled arrival times.\newline(B) Exactly 92% 92 \% of all trains arrive within 55 minutes of their scheduled arrival times.\newline(C) The student is 3% 3 \% sure that most trains arrive within 22 minutes of their scheduled arrival times.\newline(D) The student is 97% 97 \% sure that exactly 92% 92 \% of all trains arrive within 22 minutes of their scheduled arrival times.

Full solution

Q. An engineering student randomly sampled the train arrival times at a nearby train station. Based on the results, the student estimates that 92% 92 \% of the trains arrived within 22 minutes of their scheduled arrival times. The margin of error for this estimation is 3% 3 \% . Which of the following is the most appropriate conclusion about all train arrival times at the station, based on the given estimate and margin of error?\newlineChoose 11 answer:\newline(A) It is plausible that 89% 89 \% and 95% 95 \% of all trains arrive within 22 minutes of their scheduled arrival times.\newline(B) Exactly 92% 92 \% of all trains arrive within 55 minutes of their scheduled arrival times.\newline(C) The student is 3% 3 \% sure that most trains arrive within 22 minutes of their scheduled arrival times.\newline(D) The student is 97% 97 \% sure that exactly 92% 92 \% of all trains arrive within 22 minutes of their scheduled arrival times.
  1. Calculate Lower Bound: Calculate the lower bound of the confidence interval using the given estimate and margin of error.\newlineLower bound = Estimate - Margin of error\newline= 92%3%92\% - 3\%\newline= 89%89\%
  2. Calculate Upper Bound: Calculate the upper bound of the confidence interval using the given estimate and margin of error.\newlineUpper bound = Estimate + Margin of error\newline= 92%+3%92\% + 3\%\newline= 95%95\%
  3. Compare Confidence Intervals: Compare the calculated confidence interval with the provided answer choices.\newlineThe confidence interval is from 89%89\% to 95%95\%, which matches answer choice (A)(A).

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