A statistics professor wishes to estimate the average mark on a term test for a course that has multiple sections and many students. A survey of some of the students registered for the course reveals the following results: The student from the course wonders whether the population mean could have been 60 or 80.
A) Since 80 is within the 95% confidence interval, the population mean is likely to be 80.
B) Since 80 is not within the 95% confidence interval, the population mean is not likely to be 80.
C) Since 60 is within the 95% confidence interval, the population mean is likely to be 60.
D) Since neither 60 nor 80 is within the 95% confidence interval, the population mean is not likely to be 60 or 80.

Question

A statistics professor wishes to estimate the average mark on a term test for a course that has multiple sections and many students. A survey of some of the students registered for the course reveals the following results:  The student from the course wonders whether the population mean could have been 60 or 80.
A) Since 80 is within the 95% confidence interval, the population mean is likely to be 80. 
B) Since 80 is not within the 95% confidence interval, the population mean is not likely to be 80. 
C) Since 60 is within the 95% confidence interval, the population mean is likely to be 60. 
D) Since neither 60 nor 80 is within the 95% confidence interval, the population mean is not likely to be 60 or 80.

Quizplus · Accepted Answer

The Answer of A statistics professor wishes to estimate the average mark on a term test for a course that has multiple sections and many students. A survey of some of the students registered for the course reveals the following results:  The student from the course wonders whether the population mean could have been 60 or 80.
A) Since 80 is within the 95% confidence interval, the population mean is likely to be 80. 
B) Since 80 is not within the 95% confidence interval, the population mean is not likely to be 80. 
C) Since 60 is within the 95% confidence interval, the population mean is likely to be 60. 
D) Since neither 60 nor 80 is within the 95% confidence interval, the population mean is not likely to be 60 or 80.

A Statistics Professor Wishes to Estimate the Average Mark on a Term