Two Hundred Students Are Enrolled in an Economics Class

question 95

Essay

Two hundred students are enrolled in an Economics class. After the first examination, a random sample of 6 papers was selected. The grades were 65, 75, 89, 71, 70 and 80.
a.Determine 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 95% confidence interval for the mean grade of all the students in the class.

---

Definitions:

Expected Frequency

The predicted count of occurrences in each category of a statistical distribution, used as a comparison in chi-square tests.

Type B

A personality typology that describes individuals as more relaxed, non-competitive, and generally less stressed than their Type A counterparts.

Expected Frequency

The theoretical frequency of an event or category based on a probability distribution in statistical analysis.

Expected Frequency

The theoretical frequency or count of occurrences predicted for a category within a distribution, based on probability calculations.