Twenty?five adult citizens of the United States were asked to estimate the avera
ID: 3372085 • Letter: T
Question
Twenty?five adult citizens of the United States were asked to estimate the average income of all U.S. households. The mean estimate was x¯=$65,000 and s=$15,000 . (Note: The actual average household income at the time of the study was about $79,000 .) Assume the 25 adults in the study can be considered an SRS from the population of all adult citizens of the United States.
Which of the statements would cause the most worry about the validity of a 95% confidence interval for the mean estimate of the average income of all U.S. households based on the information?
A- You do not know the true population mean ? .
B- You notice that there is a clear outlier in the data.
C- A stemplot of the data is bell?shaped, so a z ?procedure is the appropriate procedure.
D- You do not know the population standard deviation ? .
Explanation / Answer
Solution: Which of the statements would cause the most worry about the validity of a 95% confidence interval for the mean estimate of the average income of all U.S. households based on the information?
Answer: B - You notice that there is a clear outlier in the data.
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