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Question 1: (12 marks) Correct to three decimal places if necessary. (1) The undergraduate GPA for...

Question 1: (12 marks) Correct to three decimal places if necessary.


(1) The undergraduate GPA for students admitted to the top graduate business schools was 3.37. Assume this
estimate was based on a sample of 120 students admitted to the top schools. Using past years' data, the
population standard deviation can be assumed known with = 0:28. What is the 95% condence interval
estimate of the mean undergraduate GPA for students admitted to the top graduate schools.


(2) The Dean wants to estimate the mean number of hours worked per week by students. A sample of 49 students
showed a mean of 24 hours with a standard deviation of 4 hours. What is the 95% condence interval for the
average number of hours worked per week by the students?

math   Statistics-And-Probability   
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