Question
students are enrolled in an Economics class. After the first examination, a random sample of 5 papers was selected. The grades were 62, 73, 85,
students are enrolled in an Economics class. After the first examination, a random sample of 5 papers was selected. The grades were 62, 73, 85, 71, and 92.
a. | Calculate the estimate of the standard error of the mean. |
b. | What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why. |
c. | Assume the assumption of Part b is met. Provide a 90% confidence interval for the mean grade of all the students in the class. |
d. | If there were 200 students in the class, what would be the 90% confidence interval for the mean grade of all the students in the class? |
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