# sce intervals nce Intervals nfidence intervals Ethan Thral In Review Mode - no scores will be...

sce intervals nce Intervals nfidence intervals Ethan Thral In Review Mode - no scores will be sa Create new versions of all questio Show Intro/Instructia 4.13 Waiting at an ER, Part I: A hospital administrator hoping to improve wait times decides to estimate the average emergency room waiting time at her hospital. She collects a simple random sample of 64 patients and determines the time (in minutes) between when they checked in to the ER until they were first seen by a doctor. A 95% confidence interval based on this sample is (128 minutes, 147 minutes), which is based on the normal model for the mean. Determine whether the following statements are true or false, and explain your reasoning. (a) This confidence interval is not valid since we do not know if the population distribution of the ER wait times is nearly Normal. false true Show Answer (b) We are 95% confident that the average waiting time of these 64 emergency room patients is between 128 and 147 minutes. false true Show Answer MacBook Air

a) False, since sample size is large enough (> 64), we can approximate the sampling distribution of sample mean by normal distribution using Central limit theorem.

b) True

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