You are working as an assistant to the dean of institutional research at your university. The dean wants to survey members of the alumni association who obtained their baccalaureate degrees 5 years ago to learn what their starting salaries were in their first full-time job after receiving their degrees. A sample of 150 alumni is to be randomly selected from the list of 2,100 graduates in that class. If the dean's goal is to construct a 90% confidence interval estimate for the population mean starting salary, why is it not possible that you will be able to use the expression X+ Zo 06- for this purpose? Explain. Why is it not possible to use the equation? A. The population standard deviation a is not known. B. The sample size n is too large to use this expression. C. The sample sizen is not large enough to use this expression. D. The sample mean X might not be a whole number, but the number of students must be.

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You are working as an assistant to the dean of institutional research at your university. The dean wants to survey members of the alumni association who obtained
their baccalaureate degrees 5 years ago to learn what their starting salaries were in their first full-time job after receiving their degrees. A sample of 150 alumni is to
be randomly selected from the list of 2,100 graduates in that class. If the dean's goal is to construct a 90% confidence interval estimate for the population mean
starting salary, why is it not possible that you will be able to use the expression X+ Zo 06-
for this purpose? Explain.
Why is it not possible to use the equation?
A. The population standard deviation a is not known.
B. The sample size n is too large to use this expression.
C. The sample sizen is not large enough to use this expression.
D. The sample mean X might not be a whole number, but the number of students must be.
Transcribed Image Text:You are working as an assistant to the dean of institutional research at your university. The dean wants to survey members of the alumni association who obtained their baccalaureate degrees 5 years ago to learn what their starting salaries were in their first full-time job after receiving their degrees. A sample of 150 alumni is to be randomly selected from the list of 2,100 graduates in that class. If the dean's goal is to construct a 90% confidence interval estimate for the population mean starting salary, why is it not possible that you will be able to use the expression X+ Zo 06- for this purpose? Explain. Why is it not possible to use the equation? A. The population standard deviation a is not known. B. The sample size n is too large to use this expression. C. The sample sizen is not large enough to use this expression. D. The sample mean X might not be a whole number, but the number of students must be.
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