SOLVED:A random sample of 50 12th-grade students was asked how long it took to get to school. The sample mean was 16.2 minutes, and the sample standard deviation was 12.3 minutes. (Source: AMSTAT Census at School) a. Find a 95 % confidence interval for the population mean time it takes 12 th-grade students to get to school. b. Would a 90 % confidence interval based on this sample data be wider or narrower than the 95 % confidence interval? Explain. Check your answer by constructing a 90 % confid
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